Maloin, a maritime station guard, spends his nights at the port signal box. One night, he becomes the witness of a murder: for a simple suitcase smuggled, the altercation between the two men turns to drama. While the first falls and drowns, the second flees. Maloin, instead of warning the police, decides to dive in and recover the suitcase...which contains more than 3 million in small denominations! That's when the trouble begins...

Anthology film with three shorts each featuring a famous detective: Monsieur Wens, Lemmy Caution and Maigret.

Maigret is called to the high-class Hotel Majestic to investigate a body. The wife of a wealthy American has been killed - but to Maigret's surprise she has a gun in her purse. He begins to follow up the handful of clues that could explain her secret life and her demise.

1939 film by Claude Autant-Lara, Maurice Lehmann

In the peaceful alpine village of Granges-de-Mortes, a tragedy has just taken place: Gustave Boeuf, the local Casanova, has mysteriously died at the foot of a wayside cross. Shortly afterwards, a peasant, who is suspected of having murdered him, hangs himself from a branch of the calvary. But was he the real culprit? Angélique Barrodet, an old maid , who had been Gustave's fiancée before he abandoned her on the very day of their wedding, leads the investigation in her own way.