Tell Me Whom to Kill(1965)

Original title: Dis-moi qui tuer

On the Côte d'Azur, a beautiful adventuress and a strange German tourist set themselves the courteous challenge of discovering a war treasure lying at the bottom of a bay. But Basta, an old original who alone knew the location of the wreck, is murdered. And Pitou, the jovial nightclub owner, is determined to get his hands on all the loot.