|Director: Robert Birchall, Manny Cardoza, Wilson S. Hong, Tom Hanson
||Writer: Manny Cardoza, Ray Cantrell
|Run time: 87 minutes
||Release date: 1971-04-07
|Floor location: Horror
|Production Countries: United States of America
|Spoken Languages: English
The San Francisco area is beset by a series of seemingly random murders without motive or pattern. The police are taunted by phone calls and letters. Could the maniac be the violent, truck driver, or the seemingly mild-mannered mailman, or even a cop?