Marceau (Gildor Roy), a detective straddling the edge of sanity, is being stalked by an anonymous man. While walking through a seemingly abandoned train yard, he has a sudden confrontation with a group of junkies and murders them. As a result, Marceau quits his post. But, while passing by the police academy, he notices Camille (Céline Bonnier), a young female cadet who is having trouble with her weapons training. He agrees to coach her if she helps him track down the ill-intentioned stalker.