The Mystery of Raoul Wallenberg
A non fiction book by Thurston Clarke and Frederick E Werbell
"His fate is one of the great unsolved mysteries of World War II. He was Raoul Wallenberg; the handsome, aristocratic you diplomat from neutral Sweden who saved 30,000 Jews from the jaws of the Nazi death machine - only to disappear, at the war's end, into the silent hell of a Soviet prison."
Used availability for Thurston Clarke's Lost Hero
April 1985 : USA Mass Market Paperback