Un criminel évadé d'un hôpital psychiatrique enlève la femme et la fille d'un policier, Thomas Crosky, dit Cross.

Violette Castillon, a young Parisian lawyer, goes to the Île de Ré where a criminal named Stany claims her to ensure his defense. In exchange, he will tell her the truth about his father, the late robber José Rocca. The day after Violette's arrival on the island, Stany is attacked, a notable from the region is found hanged and other misfortunes befall the island. While the dead are multiplying around her, Violette is determined to discover the truth.

隐居非洲的普拉特原是一精干的警官，十年前妻子被杀，嫌疑犯因证据不足被释放。心灰意冷的他因此隐居非洲悉心抚养女儿，谁想到，女儿也在法国被害。普拉特决心振作起来，为女儿报仇。在调查中他发现杀人者是自称“执刑队”的人干的，而让他不能接受的事实是，真正的幕后策划者却是他的朋友、警察局长雷内。普拉特在女检察官的配合下，将罪犯一一处决。雷内最终也忍受不了普拉特对他的羞耻而自杀。

Emile Chenal and his wife, Françoise, leaned on boxing manager Jim Fox Warner to cough up the considerable sum of money that he owes them, with both the police and the mob circling the situation. In the same hotel, Inspector Neveu looks into a murder that took place years before, and his storyline overlaps with the arc of the Chenals.