Publisher: Ballantine Books
“LITERATE AND SAVVY . . . BRIMS WITH WARTIME INTRIGUE.”—The Washington Post Book WorldEngland 1943. Much of the infamous Nazi Enigma code has been cracked. But Shark, the impenetrable operational cipher used by Nazi U-boats, has masked the Germans' movements, allowing them to destroy a record number of Allied vessels. Feeling that the blood of Allied sailors is on their hands, a top-secret team of British cryptographers works feverishly around the clock to break Shark. And when brilliant mathematician Tom Jericho succeeds, it is the stuff of legend. . . .“A TENSE AND THOUGHTFUL THRILLER.”—San Francisco ChronicleUntil the unthinkable happens: the Germans have somehow learned that Shark has been cracked. And they've changed the code. . . .“SUSPENSEFUL AND FASCINATING.”—The Orlando SentinelAs an Allied convoy crosses the U-boat infested North Atlantic . . . as Jericho's ex-lover Claire disappears amid accusations that she is a Nazi collaborator . . . as Jericho strains his last resources to break Shark again, he cannot escape the ultimate truth: There is a traitor among them. . . .“GRIPPING . . . CAPTIVATING .”—New York Daily News"ELEGANTLY RESEARCHED . . . Readers will find themselves perfectly placed to experience one of Britain's finest hours."—People"SATISFYING . . . Harris does a crackerjack job here, playing his characters' lives off historical events in surprising ways."—Entertainment Weekly“SUSPENSEFUL . . . FIENDISHLY CLEVER.”—Detroit Free Press
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