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The dazzling new novel in the #1 "New York Times"-bestselling series from the grand master of adventure.
It is called zero point energy, and it really exists--a state of energy contained in all matter everywhere, and thus all but unlimited. Nobody has ever found a way to tap into it, however--until one scientist discovers a way.
Or at least he thinks he has. The problem is, his machines also cause great earthquakes, even fissures in tectonic plates. One machine is buried deep underground; the other is submerged in a vast ocean trench. If Kurt Austin and Joe Zavala and the rest of the NUMA team aren't able to find and destroy them, and soon, the world will be on the threshold of a new era of earth tremors and unchecked volcanism.
Now, that can't be good.

515 pages, Hardcover

First published May 28, 2013

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3584 people want to read

About the author

Clive Cussler

622 books8,453 followers
Cussler began writing novels in 1965 and published his first work featuring his continuous series hero, Dirk Pitt, in 1973. His first non-fiction, The Sea Hunters, was released in 1996. The Board of Governors of the Maritime College, State University of New York, considered The Sea Hunters in lieu of a Ph.D. thesis and awarded Cussler a Doctor of Letters degree in May, 1997. It was the first time since the College was founded in 1874 that such a degree was bestowed.

Cussler was an internationally recognized authority on shipwrecks and the founder of the National Underwater and Marine Agency, (NUMA) a 501C3 non-profit organization (named after the fictional Federal agency in his novels) that dedicates itself to preserving American maritime and naval history. He and his crew of marine experts and NUMA volunteers discovered more than 60 historically significant underwater wreck sites including the first submarine to sink a ship in battle, the Confederacy's Hunley, and its victim, the Union's Housatonic; the U-20, the U-boat that sank the Lusitania; the Cumberland, which was sunk by the famous ironclad, Merrimack; the renowned Confederate raider Florida; the Navy airship, Akron, the Republic of Texas Navy warship, Zavala, found under a parking lot in Galveston, and the Carpathia, which sank almost six years to-the-day after plucking Titanic's survivors from the sea.

In addition to being the Chairman of NUMA, Cussler was also a fellow in both the Explorers Club of New York and the Royal Geographic Society in London. He was honored with the Lowell Thomas Award for outstanding underwater exploration.

Cussler's books have been published in more than 40 languages in more than 100 countries. His past international bestsellers include Pacific Vortex, Mediterranean Caper, Iceberg, Raise the Titanic, Vixen 03, Night Probe, Deep Six, Cyclops, Treasure, Dragon, Sahara, Inca Gold, Shock Wave, Flood Tide, Atlantis Found, Valhalla Rising, Trojan Odyssey and Black Wind (this last with his son, Dirk Cussler); the nonfiction books The Sea Hunters, The Sea Hunters II and Clive Cussler and Dirk Pitt Revealed; the NUMA® Files novels Serpent, Blue Gold, Fire Ice, White Death and Lost City (written with Paul Kemprecos); and the Oregon Files novels Sacred Stone and Golden Buddha (written with Craig Dirgo) and Dark Watch (written with Jack Du Brul).

Clive Cussler died at his home in Scottsdale, Arizona on February 24, 2020.

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Displaying 1 - 30 of 403 reviews
Profile Image for Brenda.
4,984 reviews2,981 followers
October 6, 2018
Kurt Austin was currently on leave in Sydney, Australia where the conference he was attending in the halls of the Opera House was boring him to tears. His escape, on the pretext of taking an urgent call, led him to a young woman who also seemed to be escaping the boredom; plus a helicopter and a fleeing speedboat. The suddenness of Kurt’s awareness of danger came when he heard gunfire; then the crashing of the boat meant he leapt into action. When the helicopter subsequently hit the Opera House, Kurt and Hayley’s life changed in an instant.

When Kurt called in his best friend and colleague Joe Zavala to help in the investigation, they had no idea what would be involved. But they needed to fix the problem sooner rather than later, or the world, starting with Australia, would be forever changed…

Zero Hour is the 11th in the Numa Files series by Clive Cussler, and although I haven’t read a Cussler adventure in a long time, the intense pace and full on action is still the same. Fun and entertaining, it's light, but thrilling reading where you know the good guys always win – but do they? Highly recommended.
389 reviews
June 6, 2013
Typical Clive Cussler: something to read for an afternoon getaway from reality. True escapism.

Nothing extraordinary; but then again, perhaps being basically free from offensive language might be considered extraordinary in today's world of fiction. I'm appreciative of that - I find myself whining a lot about the pervasive use of offensive language that does nothing to further the plot or characters. My hat is off to those who can weave a grand tale and hold my interest without resorting to such a mechanism.


Anyone wanting a wild ride of a read without a lot of mental stimulation will pretty much never go wrong with a book by Cussler.

Profile Image for Bill Riggs.
882 reviews14 followers
March 17, 2024
Interesting concept concerning zero point energy with an equally interesting villain. This book has all the makings of a summer blockbuster movie. Once again the NUMA team rush to save the world from a madman’s evil plan.
Profile Image for Aria Coswin.
74 reviews31 followers
November 21, 2021
Not a deadly virus but i'll take it.
9.5/10 reccomend.

Would've liked to see Hailey kick more ass than she did 🤔
Author 23 books43 followers
July 30, 2025
This was a fairly typical “Clive Cussler” novel, I use quotes because he died some time ago, and stopped writing the books even before that. Frankly, Graham Brown and Justin Scott (Isaac Bell series) do a better job than Clive himself once he started to lose interest in writing. The book has interesting settings, lots of action, and Kurt and Joe (pretty much clones of Dirk Pitt and Al Giordano) are up to their usual wild antics saving the world. Worth reading if you are a fan of the Cussler universe.
Profile Image for Barbara ★.
3,506 reviews282 followers
August 6, 2016
Clive Cussler writes the best "over-the-top" thrillers. So unlikely but still fun to experience. This one took place mostly in Australia and I simply loved listening to the Australian accents. It made my enjoyment of the story just that much better. I missed a few in the series so there were a few promotions that rather surprised me. Guess I have to back track and read the remaining books in sequence to find out how these events transpired.
6,726 reviews5 followers
January 5, 2021
Entertaining reading 📚

Another very will written romantic thriller mystery in the Numa Files Series. The characters are interesting and will developed. The story line is complicated fast moving with lots of action leading to the conclusion. I would recommend this series to fans of action thrillers. Enjoy reading 🔰2021 ⚓
Profile Image for Bruno.
245 reviews2 followers
November 21, 2021
Adorei! Entretenimento puro, muito bem escrito! A sensação de leitura foi como se estivesse no cinema 4G.
Foi o primeiro deste autor Clive Culsser que resolvi experimentar. Este é o vol 11 da série NUMA e não me fez confusão!
Vou ler mais livros desta série!
Profile Image for Linda.
2,273 reviews58 followers
July 31, 2021
More non-stop adventure for Kurt and the team. Poor guy can’t even take a vacation without saving the world. I enjoyed this but wish the Trouts had been it more.
Profile Image for Jordan Anderson.
1,710 reviews46 followers
March 15, 2025
If you’ve read one NUMA novel, you’ve pretty much read them all and Zero Hour is no exception. The plot follows the same well-worn formula: a world-ending scientific disaster is looming, a megalomaniacal villain is behind it, and Kurt Austin and his team must race against time to stop it. Swap out the names, locations, and specific doomsday device, and you’ve got the same, paint by numbers adventure we’ve seen in every NUMA Files book.

But let’s be honest, that’s part of the appeal, right? There’s a certain comfort in knowing exactly what you’re going to get with a Clive Cussler novel: action, adventure, and just enough scientific plausibility to make the whole thing feel larger than life. It’s also clear that the NUMA series as a whole is no longer really Cussler’s creation. With Graham Brown now having co-authored four of these, his influence is becoming more apparent. While the over-the-top action and globe-trotting adventure are still here, Brown’s take on the series feels a little more mature, a little more refined, and even slightly more violent (we get a bit more blood and torture in his books than Kemprecos’s half a dozen or so). All of that works well for Cussler’s first spinoff series, which, let’s be honest, was getting a bit long in the teeth.

In Zero Hour, the characters feel slightly deeper, the stakes a little more intense, and the narrative a bit more polished compared to the earlier books. And, speaking of characters, there’s noticeable less page time for the Trouts, who aren’t terrible side characters, but had become more and more insufferable with each successive book. Brown must have felt the same way as they are relegated to a very small (albeit important) role that fits their narrative more realistically than previous storylines had them heading in. Also absent is Pearlmutter, the obese maritime expert of Dirk Pitt novels, who also played parts in other NUMA books, and became a bit of a Deus Ex Machina which began to make these books feel silly and cheap.

Overall, Zero Hour is still very much a Cussler-style thrill ride, but with a noticeable shift in tone that keeps things fresh enough to stay engaging. I said in a previous review that I’ve slowly begun to realize that Cussler’s books (well, Cussler’s co-author’s books since he wasn’t really writing anything anymore at this point probably won’t ever manage to wow me like they did back when I was 13 and discovering the joys of reading books, but I can still enjoy them for what they are, which, in this case, is basically comfort reading. And like I said in that previous review, I think it’s time to classify Cussler novels as “cozy-thrillers”.
Profile Image for Jennifer.
401 reviews1 follower
January 17, 2019
I love Clive. He did a great job researching Australia, but they that read it on Cd not so much. Nobody says "zero zero zero", it's "triple zero". Nobody says the letters A S I O, it's a word a-zee-oh. But I like the story and how he ties in real events. The fake Australian accents were really bad, they should have hired my daughter.
103 reviews
August 31, 2023
I felt the writing style was exceptionally good for this type of content and the scientific and technical details were interesting and mostly believable. But I was a little disappointed with the plot, finding it read more like an Austin Powers/Dr. Evil script than a Kurt Austin adventure. Despite wishing for a more complex story, I enjoyed my time reading this novel - engrossing and enjoyable.
Profile Image for Megan.
560 reviews2 followers
December 25, 2023
Very quickly paced, no dead time and I appreciated that you did need to have read the previous novels to understand this one. The characters were pretty flat and the hero Kurt Austin was the typical can do no wrong is too lucky to be real type for me. Also the science is super sketchy but I enjoyed it.
Profile Image for Tory Wagner.
1,299 reviews
March 26, 2020
This is part of a long standing sci-fi series with engaging characters and some interesting plot twists. If you enjoy this one, you might want to start at the beginning of the series and see how the story line and characters develop.
Profile Image for Richa.
474 reviews44 followers
October 3, 2017
A good fast paced adventure, a-la James Bond. Light, frothy, fast, testeterone driven, adrenalin boosting, save the world set up.
Profile Image for Shannon.
772 reviews118 followers
April 28, 2018
I finished this one yesterday and it was SO MUCH FUN! How refreshing to read an adventure story, often at sea no less! Definitely will be going to the beginning of this series and starting to read it from there. A total (and often literal) blast!
Profile Image for Jessy.
1,019 reviews70 followers
October 22, 2019
Otra gran aventura de Kurt y Joe
478 reviews1 follower
February 11, 2021
Average read - not the same as the good old Dirk Pitt books!
Profile Image for Anna.
1,387 reviews12 followers
August 28, 2022
"Jeśli ignorujemy to, co wydaje się niemożliwe, to zwykle później i tak trzeba się z tym zmierzyć.".
Profile Image for Kathy Davie.
4,876 reviews734 followers
June 21, 2013
Eleventh in the NUMA Files action suspense series revolving around Kurt Austin and Hayley Anderson.

My Take
Almost the usual Cussler adventure. Yeah, almost, the earlier novels have a greater sense of action, tension, and drama. I don't know if it's a lack in the writing or if the writing is leaving me ambivalent about the drama because Kurt Austin always saves the day, so I'm not worried. Sure, it's fun, and I enjoy reading it, but my heart doesn't race. The great train hold-up was exciting as I was curious as to how Kurt and Joe would escape the bad guys; the sinking of the Orion had almost no excitement about it, no drama, almost no worry from his friends. Oh, the words were here, but there wasn't any heart to it. The rescue and turnabout by the Rama, their invasion of Heard Island, and the rescue there were more exciting, but only in comparison to the earlier events.

Not the drama and tension I was expecting anyway. It's still a great adventure with diving deep in the middle of the Great Australian bugger-all, a train escape, sunken ships, marooned on an island, capture and torture...you know, the usual. What the bad guys did to the Pacific Voyager is pretty amazing.

I loved Bradshaw's comment about just needing to see the highlights of Austin's career…! Then there's the NSA not wanting to share their toys---love to see them getting hacked.

I can see the Japan incident as a reason for Thero believing he's entitled to a revenge, but Cussler/Brown are rather brief about all the incidents that build up to Thero's reasons.

Hmmm, is there a future with Hayley Anderson…?

The Story
After Bradshaw brushes him off, Kurt dives in on his own. Literally. It's a good thing as the bad guys are about to scuttle the station and kill Hayley. Meanwhile, Joe is is busy generating enough power to call in a rescue.

The Characters
Kurt Austin is experienced in underwater salvage and is the Director of Special Projects for the National Underwater and Marine Agency (NUMA). He always partners up with Joe Zavala, NUMA's mechanical engineering specialist.

Paul and Trout Gamay are oceanographers with NUMA, testing the Gemini's new and improved ability to scan the seafloor before they're called into action.

Hayley Anderson is a theoretical physicist at the University of Sydney who has particular experience with this threatening science. She's terrified of flying.

Cecil Bradshaw is with the Australian Security Intelligence Organisation (ASIO). Wiggins is one of his men.

Dirk Pitt is the director for NUMA. Hiram Yaeger is NUMA's resident computer genius, and he's upgrading his computers again. I miss the hologram who used to interact with him. Bernadette Conry is a ten-year veteran with NUMA and oversees communications. Captain Winslow helms the Orion. James Sandecker is still vice-president of the U.S.; Jim Culver is the pissy head of the NSA. "Commander Matilda Wallaby" prepares a show of force.

Maximilian Thero is a brilliant and whacko nuclear engineer and a self-taught physicist. George is Thero's more kindly son and the "chief designer of the latest version of Thero's system. Since events in Japan and his daughter, Tessa's, death, he's gone off the deep end. Janko Minkosovic is Captain of the Guard for Thero. A man with no honor. Sebastian Panos is a Cypriot engineer caught in an underwater nightmare. Patrick Devlin turns to alcohol after the storm sank the Pacific Voyager. Masinga is one of the mineworkers, and he has been underground a very long time.

Anton Gregorovich is a bear of an assassin paid by Dmitry Yevchenko, a.k.a., the Siberian Butcher, a Russian billionaire. He's irritated with Gregorovich's lack of follow-through. Gregorovich heads out with a mixed crew aboard the MV Rama. Victor Kirov, a GRU man, answers to someone else.

The Prologue - 1906
Brigadier General Hal Cortland, who is in charge of special procurements, is skeptical about Dr. Daniel Watterson's claims.

The Cover
The cover is a blast of complements with the blue waters, sky, and shadows on the Sydney Opera House just as a speedboat and a helicopter explode in a burst of oranges.

The title reflects the countdown to Zero Hour provided by the bad guys.
Profile Image for Susan.
1,455 reviews
May 23, 2013
I received an ARC of this book in exchange for an honest review. I’m also a long time Clive Cussler fan and have been looking forward to the release of this book since it was announced. ZERO HOUR is the second collaboration between Cussler and Graham Brown. It is also the latest saga for my two favorite NUMA characters - Kurt Austin and Joe Zavala.

What do Nicolas Tesla, the Great San Francisco earthquake, a sunken ship, and the Australian Outback have in common? They form the backdrop of this Kurt and Joe NUMA Files adventure. Somehow trouble always seems to find Kurt even when he is on vacation and attending an

While this book is a continuation of the NUMA storyline, first time readers will be able to pick it up and not feel left out. A great book for summer reading. You won’t be disappointed.
Profile Image for Balthazar Lawson.
756 reviews8 followers
November 17, 2021
Kurt Austin is in Australia when he is caught up in the middle of a what is thought to be a terrorist attack on the Sydney Opera House. But it's an ASIO operation that he has blundered into the middle of, though he doesn't do much harm.

It's only when he interrupts Joe Zavala's holiday and takes a personal interest in the ASIO operation out of pure curiosity he inadvertently saves the lives of several agents. While recovering from this event he is asked to help as there has been a treat made against Australia and there appears to be a mole in the organization. Kurt and team have set out to save the world from a man hell bent on revenge.

This is another over the top story, this time based in Australia. It's interesting and easy to read, better than some.
Profile Image for Kathy Dube.
1 review
June 3, 2013
I received an ARC of Zero Hour as part of a GoodReads first reads giveaway; this review is based on that copy.

I enjoyed the book - it has all the familiar NUMA characters, exciting plot, evil villains, and action you expect from a Clive Cussler book. I liked it more that some other books in this series that I've read; it was fast paced and kept my attention. I recommend it if you like the NUMA Files series.
Profile Image for Yisrael Dubov.
93 reviews3 followers
June 29, 2021
Action packed and suspenseful!

I loved the idea of establishing a character as evil or malicious, but then realizing that there are higher things at stake and we end up rooting for the villain!

Though at times the comebacks and quips were cheesy, overall the story was enjoyable and exciting throughout. Plus, it's great to learn about theoretical technologies that might very well become reality... but maybe that's just me hoping.
Profile Image for Michael crage.
1,128 reviews5 followers
June 26, 2022
This was another NUMA novel. Krt Austin was the main chaaracter, but some of the otherNUMA people were involved especially Joe Zavala. The book's story centers around zero point energy. Reading it to start with, I thoght this was a made up thing, but checking it out, The science in the book is true. In it someone thinks he has found a way to use zero point energy, but it causes problems to include earthquakes.
Displaying 1 - 30 of 403 reviews

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