Two ex-Secret Service agents must face a dark world of violence, codes, and spies at a secret CIA training camp in this #1 New York Times bestseller about a mystery that could destroy the nation.

Near Washington, D.C., there are two clandestine institutions: the world’s most unusual laboratory and a secret CIA training camp. Drawn to these sites by a murder, ex-Secret Service agent Sean King encounters a dark world of mathematicians, codes, and spies. His search for answers soon leads him to more shocking violence-and an autistic girl with an extraordinary genius.

Now, only by working with his partner, Michelle Maxwell, who is battling her own personal demons, can he catch a killer…and stop a national threat.

What's Inside

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Praise

"Compulsively readable...Baldacci, always strong on suspense...finds his voice here. The best entry in the series."—Booklist (starred review)
"Exciting...good fun and fast-paced."—Midwest Book Review
"Keeps a reader turning pages."—Washington Post Book World
"Simply entertaining."
Pittsburg Post-Gazette
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