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Operation Trinity (The 39 Clues: The Cahill Files, #1)
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Operation Trinity (The 39 Clues: The Cahill Files #1)

4.09 of 5 stars 4.09  ·  rating details  ·  2,863 ratings  ·  70 reviews
A brand new adventure from the world of The 39 Clues!
For 500 years, the Cahills have been the most powerful family in the world. For 500 years, they've protected the source of their power - the 39 Clues. And for 500 years, they've kept their secrets silent. Until now.
This extraordinary stand-alone novel cracks open the Cahill vault to tell the story of the most coveted p
Hardcover, 144 pages
Published May 8th 2012 by Scholastic Inc. (first published May 1st 2012)
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The Maze of Bones by Rick RiordanInto the Gauntlet by Margaret Peterson HaddixThe Sword Thief by Peter LerangisOne False Note by Gordon KormanThe Dead of Night by Peter Lerangis
The 39 Clues
17th out of 39 books — 41 voters
Amaranth by John  KellettThe Hunger Games by Suzanne CollinsThe Lightning Thief by Rick RiordanCity of Bones by Cassandra ClareThe Maze of Bones by Rick Riordan
What should be read by 13 year olds
23rd out of 96 books — 20 voters

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Community Reviews

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My friends have always thought that it rather strange that I like to read "tween" books or some good old fantasy novels, rather than all those YA paranormal romances they're so fond of. But honestly, what would you rather read? A kickass tale of Grace Cahill saving an awesome piece of artwork from Nazis, or (yet another) novel about Mary Sue getting a makeover, discovering (yet another) magickal world full of magickal tall, dark, handsome, possibly secretly royal/rich guys with an angsty past, a ...more
Quick & not bad. I was actually impressed by the characters, not so much by the plots, though. The overall plot is kind of cool, sort of a DaVinci Code thing, but with paintings. This one is broken into 3 different sections taking place in the 1500's with one character, 1945 & 2008(?) for the others.

The main plot trope is a super important secret & massive ignorance of it. A son, the least likely, is sent off to guard, but never told anything about why, yet still takes his duty very
Doing my read-a-thon this week!! This was my first book and I read it in about 2 hours.

Notice above in the goodreads description it says this is a stand alone novel. I disagree. I feel like you might get what's going on, but you really should'nt read this unless you have actually read the 39 Clues series. I didn't even know this book existed until I was looking through the new orders from my library and saw it. Then I found out that there are four "Cahill
Jun 05, 2014 XxForeverXx_XxVampire_DiariezxxLuvsSHERLOCKandSUPERNATURAL rated it 5 of 5 stars
Recommends it for: People who like adventure
Recommended to XxForeverXx_XxVampire_DiariezxxLuvsSHERLOCKandSUPERNATURAL by: Public Library
This review has been hidden because it contains spoilers. To view it, click here.
Hailey Platfoot
The story follows main characters Matheus Jacobs, Grace Cahill, and a rich boy named Ian as they track the art named "Lamb" to find what the secret messages lead to. I personally found this book rather enjoyable and I also think that it is rather easy to follow. What I really like about it is the fact that it is suspenseful, yet it gets to the point quickly. I would recommend this book to average skilled readers because there are three different people you follow. Clifford Riley definitely did a ...more
Kevin Lin
The 39 Clues Cahill Files: Operation Trinity Scholastic Inc., 2012, 142 pp., $9.99
Clifford Riley ISBN 978-0-545-43143-9

Operation Trinity skips around to different events on people with the last name Cahill. They have to stop an evil organization, Vesper. According to the knowledge I gain after reading the book, the Cahill are supposed to be the protector of humanity, their main objective is to keep the Vesper from harming people and found out the real reason why they are after painting. What are
Hudson Campbell
I can tell you right now it's not bad, but its not the best book, either.

This book has 3 stories in it, all about a family of powerful and rich people called 'Cahills.'
It skips years, so the first story is from 1549 or something like that. The kid in this story is sent away by his family to be an altar boy, to protect an altarpiece from an organisation of people called 'The Vespers.' They are trying to get ahold of the special altarpiece because they say it has clues o a secret, we don't know w
At this point the Cahill sage, I think I enjoy the inter-book novellas more than the actual series. The smaller adventures have a stronger cohesion that doesn't seem like we're going through the same actions again and again, even though that is, in essence, what we're doing.

This story follows three events surrounding the Ghent altarpiece by Van Eyck. It was an effective way to connect that particular artwork to the sage of the Cahills and the Vespers. The first event involved the iconoclastic re
I liked how the three parts of the book spanned many years but were connected by the same piece of artwork. It's one of the reasons why I love art, knowing that when I look at something, I am connected through time and space by all the other people that have experienced the same work. It was fun to get to know Grace Cahill's character better, and Riley did a nice job of maintaining continuity with the last time we saw young Grace in Morocco however many books ago. What stunk was that there were ...more
JCS bookworm
This book was fairly good, but I liked the other series better. I think often when books are split into parts that are about different people and times, each story gets focused on a little less. I don't like short stories because I think things end up seeming unrealistic and too easy for the characters. I thought that did happen at some points in the book. I didn't like the first story as much as the others, but I thought the second and third were pretty good.
I really enjoyed reading this book. I like how it was divided into three stories. I liked the one with Ian in it, because it showed a little bit of Ian liking Amy. I loved this book and I cannot wait to read the next book.
Fun adventure story that took place in the 1500s, 1940s and 2000s. Nothing really objectionable. Refers to the Monuments Men when talking about the Ghent altarpiece.
Cathrine Bonham
The format for this book is the same as the format used in the eleventh 39 clues book Vespers Rising in which short episodes, from the far past, Grace's past, and the Present, form one story.
This is the story of the Van Eyck altarpiece. The secrets that it holds and lengths that the Vespers will go to to get it.

This has the potential to be a very interesting series expanding on the 39 clues universe and letting us get to know more of the Cahills. Sadly the rest of the books are only available as
Annette McIntyre
Three short stories from the Cahill family vault recording three attempts to steal a work of art by the Vespers.
Amazing! It is a must read for fans of the 39 clues series!
I adore the Ghent altarpiece and anything about Grace:)
leads on to cahills vs vespers great book :)
Miss Clark
This review has been hidden because it contains spoilers. To view it, click here.
Rishi G
I was really excited when I started reading this. I was really disappointed because from page 3 to page 43, the whole story was so boring. When the author started Grace's story, it got a little exciting but eventually it got boring again. The whole book doesn't have a story at all!! I have read his rapid fire series and I was amazed by the story in it. So I thought operation trinity would be a good book. It turned out to be bad. It's a ok book.
This book was a background book, filling you in on information that goes along with the series (39 clues.) It follows the Cahills, and their attempts to protect and decode a painting. It jumped between three generations, each one telling a different story.

This book was average. I didn't necessarily like it too much, but was worth a read. It gave good background info, and why things were the way they were in the the main series.
In a nutshell: A prequel to the 39 Clues and Cahills v. Vespers starring Grace Cahill.

Notes: Liked that this book featured Grace instead of Dan and Amy. But I felt like this book felt rushed and wasn't as exciting as the other books. It was nice, though, reading about Grace as a teenager—her in action like we've come to know Amy and Dan in action—and then a little bit more of her before her death (the start of 39 clues).
Melissa Sodano
Despite the fact that this book does not chronologically fall within the 39 Clues, this book provides some interesting back story. Riley follows a particular work of art by Jan Van Eyck through three (non-consecutive) generations of Cahills, each of whom must protect it from the Vespers. A fun read, though you don't have to read it in order to know what's going on in the rest of the series.
One of the best! We get to go back in time to hear , once again, from Grace Cahill in these "Cahill Files." She's really my favorite. And she's fighting Nazis in WWII. I'm only disappointed that (after much searching) the next books in this series will only be digital. I realize why, of course, they would be, but I so enjoy sharing the print edition with others.
At the first couple of pages I was confused but as I kept reading it all started making sense... I like the idea of the Cahill mission throughout the ages. Also, this book made Grace a human being in my eyes, she basically have the same thoughts and feelings as Amy and Dan when she was younger not like her almost godly status on the first books in the first series.
The kids have read The 39 Clues books before, so when I saw this on the shelf I checked it out. I haven't read the books, but I think I'm now ready to. This gives you a History on the Cahills, and the story behind the search, and who they're fighting against.
Quick, and good.
Three stories. About how they were chosen, and why they keep searching.
Angela Oliver
A short chapter book spanning three different generations of the Cahill family and following the fate of a particular painting. Fast paced and action packed, this is a good, quick read and also gives some insight into the background of Ian and Nathalie Kabra, along with their cold-blooded mother. It was also nice to see Grace playing her part.
I think it was a good book, since it happened in different times, one in the 1600s, one happening in world war 2, which I liked the best, since it is about Grace Cahill sneaking into Austria to save a painting. The third one is happening in 2009, where a guy called Ian Kabra is trying to steal top secret information from one of his enemys.
I think this book is a real secret spiller! This book lets out all of the secrets that the Cahills and Vesper families have to hide. The Catherdal is the main item in this book and it has a great significance linking to the past. If you are a person that likes secrets and ones that link to the past then I would recommend this book to you.
Wendy ~M/M Junkie~
This was a really great glimpse into 3 stories that were before and behind the scenes of the 39 Clues. One of the stories was about Grace and one of her first missions. It was really cool to read and see a part of the beginning.
If your a fan of the series I would recommend adding this to your tbr list.
This was actually 3 different stories. Each one related to one piece of artwork from History. I enjoyed the story, but there was too much missing. Each story ended so abruptly. They each needed more. Plus, it never explained why the painting was so important. Not sure I'll finish this series.
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  • Trust No One (The 39 Clues: Cahills vs. Vespers, #5)
  • The Dead of Night (The 39 Clues: Cahills vs. Vespers, #3)
  • Nowhere to Run (The 39 Clues: Unstoppable, #1)
  • Flashpoint (The 39 Clues: Unstoppable, #4)
  • Breakaway (The 39 Clues: Unstoppable, #2)
  • Countdown (The 39 Clues: Unstoppable, #3)
  • Shatterproof (The 39 Clues: Cahills vs. Vespers, #4)
  • Day of Doom (The 39 Clues: Cahills vs. Vespers, #6)
  • The 39 Clues: Agent Handbook
  • The Black Book of Buried Secrets
  • The 39 Clues Complete Collection: Books 1-10
  • The Black Circle (The 39 Clues, #5)
  • Divide and Conquer (Infinity Ring #2)

Other Books in the Series

The 39 Clues: The Cahill Files (5 books)
  • The Submarine Job (The 39 Clues: The Cahill Files, #2)
  • The Redcoat Chase (The 39 Clues: The Cahill Files, #3)
  • The Houdini Escape (The 39 Clues: The Cahill Files, #4)
  • Silent Night (The 39 Clues: The Cahill Files, #5)
Legacy (The 39 Clues: Rapid Fire, #1) Turbulence (The 39 Clues: Rapid Fire, #5) Crushed (The 39 Clues: Rapid Fire, #4) Invasion (The 39 Clues: Rapid Fire, #6) Ignition (The 39 Clues: Rapid Fire, #2)

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