Ben (Benoît Poelvoorde) is a witty, charismatic serial killer who holds forth at length about whatever comes to mind, be it the "craft" of murder, the failings of architecture, his own poetry, or classical music, which he plays with his girlfriend Valerie (Valérie Parent). A film crew joins him on his Sadomasochism adventures, recording them for a fly on the wall documentary. Ben takes them to meet his family and friends while boasting of murdering many people at random and dumping their bodies in canals and quarries. The viewer witnesses these grisly killings in graphic detail.