The Defective Detective (1984)

In a comedy that is dead-in-the-water, a disconnected series of events serves as a framework for Jerry Lewis to put on his stock-in-trade mugging act. He plays a Las Vegas policeman visiting his ex-wife in France, only to be caught up in the shenanigans of a group of art thieves. His ex-wife has remarried and her husband is undercover among the art thieves, carrying out an assignment given him by his superiors in the police force. Inevitably, the current husband and the ex-husband are bound to clash.