A mysterious diver hiding in Amsterdam's canal system embarks on a rampage of gruesome murders, terrifying city officials and leaving few clues for the city's best detective, who doesn't suspect that both his new girlfriend and twelve-year-old daughter may be closer than he is to finding the killer.

After 37 years, the canals of Amsterdam are once again turning blood red. Tara Lee is a young ambitious detective with the Amsterdam police force who is confronted by a number of gruesome incidents around the canals. She enlists the help of Visser, a retired detective who once nabbed a serial killer stalking those same canals. They face an adversary who seems to possess superhuman powers.