A Touch of Larceny(1960)

Overview:

After falling in love with an American woman, Virginia Killain, who is engaged to another man, British Naval Commander Max Easton, hatches a plan that will get him enough money to support Virginia in the lifestyle she is accustomed to. Easton's plan is to disappear for a time making it seem that he has defected to the Soviets taking important Naval secrets from his job at the Admiralty and to return and sue the newspapers for slander. Not everything goes as planned for Commander Easton.