Shy, gentle half-wit Dennis, whose only obsession is train-spotting, is released early on account of good behavior after a rape sentence. His parents who run a modest barbershop, skeptic André and Rita, desperately try to keep him out of girl trouble, but his victim's sister Barbara starts a hate campaign. After another girl reports abuse, Dennis is jailed and beaten black and blue daily. Barbara's boyfriend, lawyer Thomas Verelst, accepts to help 'pro deo' (no cost) and pleads that Dennis belongs in a mental institution.