Craig Mannings (Michael Moriarty) is a respected doctor living in the United States, who begins to experience strange visions of women being murdered.

Before long, he begins to suspect that these visions are the result of a psychic connection with his twin brother Keith (also Michael Moriarty), who supposedly died in a house fire in Cleveland at the age of 17, but who is now engaged in a murder spree.

Recognizing the scenery in one of the visions, Craig travels to Hamburg, Germany to find and stop his brother, over the protests of his girlfriend Julie Warren (Penelope Milford).

The two quickly become lovers, but their search is hampered by the local police (led by inspector Hessinger [Reinhold Olszewski]) who think Craig is to blame for Keith's murders.

[6] From retrospective reviews, Adrian Luther Smith in his book on Italian genre films praised the acting of Michael Moriarty and stated that "those seeking well-presented sleazy thrills will not be disappointed".