Living on the French Riviera, John Robie is a retired jewel thief who was once known as 'The Cat.' He catches the eye of Frances Stevens who is a pampered, vacationing heiress. But when a new rash of gem thefts occurs amongst the luxury hotels of the spectacular French playground, it appears that 'The Cat' is on the prowl once again. Robie might be reformed, but is he deviously using Frances to gain access to the tempting collection of fabulous jewelry...