Caplan is up against the wall he has agreed to stage an ATM hold-up with Lemoine to get the money for Morlighem's ransom. But when he gets there Lemoine is nowhere to be found and an unpleasant surprise awaits him. Caplan realises that the hoodlum has leaked the hold-up info to the cops and is making the most of the subsequent diversion to go and rob a diamond merchant! Surrounded by the local detective agency headed by Roxane Caplan and Vachewski manage to escape from their colleagues' clutches just in the nick of time. Time is running out. And if they have any hope at all of saving Morlighem they must find Lemoine fast and retrieve the diamonds.