The story of a hotel boss that, from time to time, observes the couples in the rooms and even films them.

Varen and Bob are a couple of buddies who get mixed up with a white-slave trader. Pursued by a pair of mob-connected brothers, Bob is killed. Varen retaliates by killing one of the brothers, then enlists the aid of his friend Agnès in tracking down the remaining sibling.

Henri Verdier, a young bank manager, has made the acquaintance of Karine, a model of great beauty. Robert, who claims to be Karine's brother, forces Karine to introduce him to Verdier. This is to offer him an urgent business deal: 50 million for a uranium purchase which, within a few days, should yield double that amount. Blinded by passion, Verdier accepts and "withdraws" the necessary sum from his bank. He soon realizes he's been duped. Karine is not Robert's sister and Robert is a crook. Verdier tracks them down.