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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

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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.

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…

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