Muriel Belmondo

L'Alpagueur is a free-lance spy from the French secret agency. He's put on the investigation about L'epervier, a serial-killer who employs young boys to help him robbing banks before killing them.

In Paris , Commissioner Stan Jalard and Inspector Simon Lecache plan to quit the police to go and enjoy a more peaceful life in the West Indies. In a nightclub, during a routine visit, they spot Schneider, a dreaded gangster and public enemy. At the time of his arrest, Simon is killed at close range by the criminal. Stan then decides to stay in the police to avenge Simon. Being the godfather of Christian, Simon's son, who sometimes lives in a boarding school, sometimes at home, he takes charge of his education. Two years later, Stan has been promoted, and he's told that Schneider had resurfaced in the capital. A long hunt begins.

Since the suicide of his wife, Jacques Loursat has gone downhill. Estranged from his daughter, his lawyer's pratice in ruins, he consoles himself with drink. One night he is woken by a gunshot and catches sight of a young man fleeing the house. Isabelle, his daughter, claims to know nothing about it, even when he finds the body of a young man. Isabelle hangs around with a gang of spoiled young people who have no shortage of money, and is in love with Joel, an ambitious boy involved in drug dealing. Antoine, from a more modest background, is in love with her. When the police start investigating Joel's murder, Antoine becomes the ideal suspect.