Three events that seemingly nothing related, namely the murder of a truck driver, the discovery of the corpse of a vitriolic young woman, and the death of another who was crushed, will launch the Inspector Maréchal on the trail of a prostitution network. The girl-mother Olga, a friend of the trucker, confesses her the underwear of the women's exploitation.
| Actor | Role |
|---|---|
 Françoise ArnoulOlga Viterbo | Olga Viterbo |
 Raymond PellegrinJo Verdier | Jo Verdier |
 Nicole MaureyYvonne Leriche | Yvonne Leriche |
 Noël RoquevertLe Souriant | Le Souriant |
 Suzy PrimPierette | Pierette |
 Marthe MercadierGinette | Ginette |
 Jane MarkenMme Anita | Mme Anita |
 Pierre SergeolRobert Le Trotteur | Robert Le Trotteur |
| MMax MégyLéandre | Léandre |
 Louis de FunèsUn Client qui joue aux cartes | Un Client qui joue aux cartes |
 Rita RenoirUne fille | Une fille |