Walter, a mentally handicapped boy, sees a murder being committed in Julie's house. Walter is put to work at Julie's fitness centre and has an eye on her. Sam believes Walter immediately. The washed out Witse doesn't care about anything anymore. Julie plays the innocent, but soon it turns out that her ex-lover, a teacher from the centre, is missing. And also her husband has gone missing. His burnt out car is found in Luxembourg. In the meantime Walter changes his story after a seduction attempt from Julie.