The Happy Hostage — Charles Stuart

When and agreement is made with the U.S. to build missile bases in Carmania, Elisabeth Renner and her friends plot to kidnap the American ambasador and force the agreement to be cancelled. However, they get the wrong man: Charles Gresham, a budding British business tycoon. And he soon finds himself sympathising with his pretty captor. Elisabeth decides to call it all off, and things really go wrong - when Charles doesn't want to be released.