A maniac in a wet suit is killing people in Amsterdam with a rather large knife and using the city's extensive canal network to get away. The police force's top man Eric Visser (Huub Stapel) is on the case though doesn't really have much to go on in the way of any leads except maybe the perpetrator can swim.
He hooks up with Laura (Monique van der Ven) who has something to do with a diving club but mostly because he fancies her. With the government putting the police under pressure as the victims start to mount up, it seems Laura might have some idea that her therapist friend Martin (Hidde Maas) is the killer, or is he?
The police work is rather haphazard and the film does meander at times but this is overall a very solid crime / slasher horror drama with some superb action set pieces including an incredible speed boat chase through the canals of Amsterdam. The ending is rather bleak and abrupt but it suits such a bloody and gruesome film.
