It Takes a Thief (1968)

Alexander Mundy - smooth, suave, sophisticated - is the world's greatest cat burglar. Finally arrested after years of pilfering, he strikes a deal with American agent Noah Bain: a full pardon if Mundy agrees to use his skills to steal for the SIA, an American espionage agency. Technically under house arrest, Mundy travels all over the world performing daring acts of thievery in the name of Uncle Sam.