The residents of San Francisco are becoming drone-like shadows of their former selves, and as the phenomenon spreads, two Department of Health workers uncover the horrifying truth.

Attendees at a horror-film convention in San Francisco keep disappearing. It turns out that the guest of honor is a real vampire, and his henchmen are kidnapping the convention guests. A horror writer, a Sherlock Holmes fan and an Israeli Nazi-hunter set out to stop him.

An Italian mechanic finds that he has inherited a billion-dollar company from his dead uncle, but he needs to be in San Francisco in 20 days to sign over the will. In the meantime, he is chased by kidnappers and the affected corporation's president.

Dirty Harry Callahan returns again, this time saddled with a rookie female partner. Together, they must stop a terrorist group consisting of angry Vietnam veterans.