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.

When the canals of Amsterdam turn blood red again after 37 years, there is only one man who can tame the evil and battle an adversary who seems to possess superhuman powers.