Jay Franklin - Rat Race

When an atomic explosion destroys the battleship Alaska, Lt. Commander Frank Jacklin returns to consciousness in New York and is shocked to find himself in the body of Winnie Tompkins, a dissolute stock-broker. Unable to explain his real identity, Jacklin attempts to fit into Tompkins' way of life. Complications develop when Jacklin gets involved with Tompkins' wife, his red-haired mistress and his luscious secretary. Three too many women for Jacklin to handle. His foreknowledge of the Alaska sinking and other top secret matters plunges him into a mad world of intrigue and excitement in Washington—that place where anything can happen and does! Where is the real Tompkins is a mystery explained in the smashing climax.
Completely delightful, wholly provocative, the Rat Race is a striking novel of the American Scene. — Summary by Book Intro