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The Doomsday Affair(1965)
(The second book in the Man From U.N.C.L.E. series)
A novel by Harry Whittington
The U.N.C.L.E. files could tell nothing about him except for that code name. He could be anyone - a cab driver, a storekeeper .. ANYONE! And he might be anywhere in the United States. But whoever or wherever he was, U.N.C.L.E. had to find him - because he controlled a secret that had the world at his mercy!
Used availability for Harry Whittington's The Doomsday Affair
February 1993 : UK Paperback