Enigma - Softcover

A member of a top-secret team of British cryptographers, Tom Jericho succeeds in cracking "Shark," the impenetrable operational cipher used by Nazi U-boats, but when the Germans change the code, Jericho must break the new code before the traitor among his group can stop him. Reprint.

TE AND SAVVY . . . BRIMS WITH WARTIME INTRIGUE."
--The Washington Post Book World
England 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 Chronicle
Until the unthinkable happens: the Germans have somehow learned that Shark has been cracked. And they've changed the code. . . .
"SUSPENSEFUL AND FASCINATING."
--The Orlando Sentinel
As an Allied convoy crosses the U-boat infested North Atlantic . . . as Jericho's ex-lover Claire disappears amid accusations that she is a N