The Switch(1976)
OVERVIEW
Our heroes find themselves at the famed Cannes Film Festival to help foil a plot to murder a former American union boss cum government witness, Kyle Sander. Suspects include the beautiful Marissa and boyfriend, who have a few surprises in store. Lord Sinclair and Danny then travel to Switzerland, where they have to help an elderly Duchess protect her jewels by finding proof of past marriage to a prince.