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.
The body of a schoolgirl is found in a meadow. The murderer is never caught, and years later; a young man named Stefano returns to the island and is reunited with his brother, the local priest.