International con artist/thief Laure Ash helps pull off a diamond robbery in Cannes during the annual film festival. She double-crosses her partners-in-crime and makes off with the diamonds to Paris where she accidentally assumes the identity of a distraught woman who commits suicide and then leaves the country. Seven years later, Laure (now called Lily Watts) re-surfaces as the wife of the new American ambassador to France where a certain Nicolas Barto, a Spanish photographer, takes her picture thereby setting the stage for a motion of events as the evil Laure resorts to low, underhanded means to protect her former identity.