The Crimson Rivers S04 E05 La dernière vague (1)

Niemans and Delaunay escort a serial killer - Philippe Cernac, known for hunting his "prey" with a bow - to an experimental prison/treatment centre where psychopaths of all kinds are dealt with... Cernac escapes, but caught by Niémans, who's still trying, with his partner Camille, to find the killer.