Gérard and Thierry are business partners who are accused of stealing a safe from a wealthy tycoon in this situation comedy. A practical joke backfires when the two make their colleague Daniel believe he has won the lottery. The owner of the safe calls the police, who chase after the scheming duo. The two steal the safe a second time to cover the loss of the money taken in the first burglary. Monique is the sultry police commissioner and former flame of the robbery victim who investigates the bizarre case.