In a polluted future Venice researchers work to improve the situation. One day, unknown forces start killing them. A team of soldiers and a couple of civilians is sent to investigate. Soon, they encounter strange murderous creatures.
In order to get some money Gianni Zappi tries to organize an insurance fraud by drowning his yacht.
A homicide detective realizes that the brutal murders committed by a mysterious serial killer he's after have something to do with the late husband of a beautiful widow.
