Harper is a cynical private eye in the best tradition of Bogart. He even has Bogie's Baby hiring him to find her missing husband, getting involved along the way with an assortment of unsavory characters and an illegal-alien smuggling ring.
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| Directing | Jack Smight | Director |
| Writing | William Goldman | Screenplay |
| Writing | Ross Macdonald | Novel |
| Production | Jerry Gershwin | Producer |
| Production | Elliott Kastner | Producer |
| Camera | Conrad L. Hall | Director of Photography |
| Editing | Stefan Arnsten | Editor |
| Art | Alfred Sweeney | Art Direction |
| Art | Claude E. Carpenter | Set Decoration |
| Directing | James H. Brown | Assistant Director |
| Sound | Frank Regula | Boom Operator |
| Crew | Paul Baxley | Stunt Coordinator |
| Art | Wayne Fitzgerald | Title Designer |
| Sound | Johnny Mandel | Original Music Composer |
| Costume & Make-Up | Gordon Bau | Makeup Supervisor |
| Costume & Make-Up | Jean Burt Reilly | Hair Supervisor |
| Production | Chuck Hansen | Unit Manager |
| Sound | Stanley Jones | Sound |
| Art | Tyrus Wong | Art Department Coordinator |
| Crew | Paul Baxley | Stunt Double |
| Crew | Paul Baxley | Stunts |
| Crew | Gene Coogan | Stunts |
| Crew | Dick Crockett | Stunts |
| Crew | Sol Gorss | Stunts |
| Crew | Bob Herron | Stunts |
| Crew | Ann Pat Kelly | Stunts |
| Crew | Sam A. Mides | Stunts |
| Crew | Herb Pacheco | Stunts |
| Crew | Harvey Parry | Stunts |
| Crew | Joe Pronto | Stunts |
| Crew | Bill Shannon | Stunts |
| Crew | Jim Sheppard | Stunts |
| Crew | Tom Steele | Stunts |
| Crew | Jerry Summers | Stunts |
| Crew | Morton C. Thompson | Stunts |
| Crew | James Turley | Stunts |
| Crew | Ron Veto | Stunts |
| Camera | Jordan Cronenweth | Assistant Camera |
| Camera | Jordan Cronenweth | Camera Operator |
| Camera | Richard Doran | First Assistant Camera |
| Camera | Richard Moore | Camera Operator |
| Camera | Kenneth B. Taylor | Grip |
| Sound | Willis Holman | Orchestrator |
| Sound | Johnny Mandel | Conductor |
| Sound | Dan Wallin | Scoring Mixer |
| Crew | Bert Steinberg | Dialogue Coach |
