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The world of One Second Per Second is the setting for Fall Of Time , a standalone story of a broken universe where time travel is easier to achieve than to avoid. Here, the battle lines are drawn. To some, the continual rewriting of history is nihilistic insanity. To others, travel in all four dimensions—including time—is an inalienable right bestowed on humankind by the new natural order. Forces are amassing on either side of the conflict as the collapse of time itself is imminent. Surprisingly, not everyone is allowing this to bother them.

"Complicated cause-and-effect shenanigans put a fresh spring in the step of time-travel SF. ... Unwin’s Vonnegut-type sense of humor about the essential absurdity of the situation yields some murky intrigues, double crosses, traps, and betrayals leapfrogging across the ages.”
— Kirkus Reviews

What readers are
★★★★★ "I thought One Second Per Second by the same author was a riveting read, and I like this book even more."
★★★★★ "... the book delivers an emotional gut-punch critique of humanity."
★★★★★ "Fall of Time will have you speeding through each page and leave you with plenty to think about even after you close the cover."
★★★★★ "All the concepts that get set up in one second per second go absolutely wild in fall of time."
★★★★★ "Compelling characters, plenty of twists, and an intriguing premise written by an author who knows his science."

248 pages, Paperback

First published May 30, 2022

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About the author

S.D. Unwin

4 books13 followers
S. D. Unwin began as a theoretical physicist searching for the Holy Grail of a quantum theory of gravity. He later turned his mathematical skills to analyzing and communicating catastrophic risk, from nuclear mishaps to major earthquakes. He has now settled happily on writing science fiction. His work includes The Magni and the time travel trilogy of One Second Per Second, Fall Of Time, and Time Wall. Hailing originally from Manchester in the United Kingdom, he now lives in the U.S. Pacific Northwest.

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5 stars
50 (39%)
4 stars
50 (39%)
3 stars
23 (18%)
2 stars
2 (1%)
1 star
1 (<1%)
Displaying 1 - 7 of 7 reviews
Profile Image for Lizz Taylor.
1,560 reviews16 followers
March 30, 2025
This was an enjoyable time travel novel which is the second in a series. It can be read as a standalone. History is a river and doesn't like to be diverted too much. This book had a complex plot with entertaining characters. I look forward to reading more in this series.
4 reviews
January 28, 2024
The sequel to One Second Per Second is every bit as good as the first. The story begins with a new cast of characters and has several interesting turns before running into our favorite characters from the first novel. The plot was riveting. I’d say more, but I’d rather not spoil the fun. If you haven’t read this sequel, I highly recommend.
1 review
October 28, 2022
A fresh look at time travel

Where other books approach time travel from the perspective of trying to make it happen, Fall of Time establishes it as a norm with those who realize the dangers trying to prevent it from happening. It's a fresh take on a well-known idea. And although it's a sequel, the new characters are robust enough to allow it to stand alone.
602 reviews2 followers
July 1, 2025
VERY DIFFICULT to Initially Understand The 1st 3rd of This Disjointed Plot

Again keeping in mind that Time Travel has many potential but strange ways to think about things — and The Author certainly met this criteria with this 3-book series.

Book #1, One Second per Second, was the best of the Trilogy, but OMG — it was certainly confusing for The Reader. While this Book #2 follows Book #1, I’m afraid it was progressively a worse and worse plot that kept pulling The Reader along — rather than allowing The Reader time (how ironic!) to understand it all.

Should you dive into this series? Yes. Whether I like it or not, EVERYONE should be exposed to Time Travel SciFi, and try to understand how non-understandable it can be.
Profile Image for Bill Jones.
489 reviews
December 30, 2025
I found this book somewhat confusing, which I can only assume was intentional given the subject matter and themes. Also the continual combat and warlike behaviour does not really appeal to me - hence the two stars. I will give the third instalment a try and see if things improve.
Profile Image for Cheryl.
1,286 reviews8 followers
October 12, 2023
Wow, what a ride! Time paradoxes are so confusing, yet so fun to think about. I like how the 3 Musketeers were worked into it all.
55 reviews
March 5, 2026
It was a little difficult to keep up with the flow but then time travel books and grandfather effects can do that.

Now to read book 3
Displaying 1 - 7 of 7 reviews