Boston is being terrorized by a series of seemingly random murders of women. Based on the true story, the film follows the investigators path through several leads before introducing the Strangler as a character. It is seen almost exclusively from the point of view of the investigators who have very few clues to build a case upon.
| Camera | Richard H. Kline | Director of Photography |
| Writing | Gerold Frank | Novel |
| Sound | Lionel Newman | Original Music Composer |
| Editing | Marion Rothman | Editor |
| Writing | Edward Anhalt | Screenplay |
| Directing | Richard Fleischer | Director |
| Production | Robert Fryer | Producer |
| Directing | David Hall | Assistant Director |
| Art | Richard Day | Art Direction |
| Art | Stuart A. Reiss | Set Decoration |
| Sound | Don J. Bassman | Sound |
| Production | James Cresson | Associate Producer |
| Production | Eric Stacey | Unit Production Manager |
| Sound | David Dockendorf | Sound |
| Art | Raphael Bretton | Set Decoration |
| Art | Walter M. Scott | Set Decoration |
| Art | Jack Martin Smith | Art Direction |
| Crew | Glenn R. Wilder | Stunts |
| Crew | Charlie Picerni | Stunts |
| Crew | Walter Scott | Stunts |
