The Ultimate Vampire Resource and Directory

The film's protagonist, Federal Marshal O'Niel, is assigned to a one-year tour of duty in Con Am 27, a titanium ore mining outpost on Jupiter's moon Io. When the Marshal investigates the violent deaths of miners he discovers that they have a common factor: the use of a dangerous amphetamine-type drug called "polydichloric euthimal" which enormously increases the miner's productivity but eventually causes psychosis (shown briefly in two grisly incidents). As a result, there has been a large increase in such deaths.

O'Niel follows the trail of the dealers which leads to the outpost's administrator, Sheppard, who has been bribing O'Niel's deputy Montone to turn a blind eye to the shipping and sale of the drug. O'Niel's wife, frustrated that he considers justice more important than his family, leaves him a message pleading with him to return with her to Earth.

O'Niel confronts Sheppard, but the administrator smugly informs him that nobody else wants the drug shipments stopped; production is up, the workers are happy, the corporate owners (Con-Amalgamate) are also happy, therefore Sheppard is happy. O'Niel vows to expose the entire scheme....