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.

Jean-Paul Belmondoas Roger Pilard, aka l'Alpagueur
Bruno Cremeras Gilbert, aka l'Epervier
Jean Négronias Spitzer
Patrick Fierryas Costa Valdez
Victor Garrivieras Doumecq
Claude Brossetas Granier
Marcel Imhoffas Director of cabinet
Maurice Auzelas Road driver 'Gros Bras'
Muriel Belmondoas First flight attendant