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Sigma Force · Book 7

The Doomsday Key

by James Rollins
Published
1 January 2009
Pages
567
ISBN-13
9780061894695
Type
novel
Buy on Amazon All Sigma Force books in order
Cover of The Doomsday Key

About this book

"The Doomsday Key" continued the Sigma Force series in 2009, positioned after "The Last Oracle" and ahead of "The Skeleton Key," part of James Rollins's run of numbered novels in which team relationships carry forward even though each book's central mystery resolves on its own.

Key facts about The Doomsday Key

The Doomsday Key is a novel by James Rollins. Readers have had it since 2009. It runs to 567 pages.

Our list holds 3 editions of The Doomsday Key. Since each edition has its own ISBN, search for 9780061894695 to find the main one.

The Doomsday Key is book 7 of 24 in the Sigma Force series. The series has 24 published books. However, the series starts with Sandstorm (2004). Crucible is the latest book in the series with a full release date, out on 22 January 2019.

Additionally, James Rollins writes Order of the Sanguines, Tucker Wayne and Moonfall as separate series. Those series sit on our thriller, supernatural thriller and fantasy shelves. Meanwhile, Trust No One is the latest published James Rollins book on file, from 24 February 2026. The next announced James Rollins release is due on 1 December 2026, so there is still more to come.

About James Rollins

James Rollins is the pen name of James Czajkowski, an American author and former veterinarian who left his practice to write adventure thrillers that blend cutting-edge science, historical mystery, and globe-trotting action. See every James Rollins book in order.

Its place in Sigma Force

The Doomsday Key is book 7 in the Sigma Force series. It follows The Last Oracle. It is followed by The Skeleton Key. See the full Sigma Force reading order.

Sigma Force is a covert unit of the U.S. Defense Advanced Research Projects Agency (DARPA), staffed by former special-forces operatives cross-trained as scientists and sent to investigate threats where cutting-edge science and ancient mystery collide. Every novel pairs a real scientific or historical hook — CRISPR gene editing, quantum physics, lost expeditions, ancient plagues, cryptozoology, Norse and biblical lore — with a globe-spanning conspiracy, and James Rollins (a veterinarian by training) grounds even…

Editions

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