After the death of his wife, wealthy retiree Justin Playfair creates a fantasy world for himself in which he is the legendary detective Sherlock Holmes, even dressing like the character. Out of concern for Justin's money more than his health, his brother Blevins puts him under the care of psychiatrist Dr. Mildred Watson. As Dr. Watson grows fond of Justin, she begins to play along with his theories, eventually becoming an assistant in his investigations.
| Directing | Anthony Harvey | Director |
| Art | John Robert Lloyd | Production Design |
| Costume & Make-Up | Fern Buchner | Costume Design |
| Costume & Make-Up | Vincent Callaghan | Makeup Artist |
| Editing | Gerald B. Greenberg | Editor |
| Production | Paul Newman | Producer |
| Sound | John Barry | Music |
| Production | John Foreman | Producer |
| Art | Herbert F. Mulligan | Set Decoration |
| Costume & Make-Up | Ann Roth | Costume Design |
| Costume & Make-Up | Romaine Greene | Hairstylist |
| Writing | James Goldman | Screenplay |
| Production | Jennings Lang | Producer |
| Camera | Victor J. Kemper | Director of Photography |
| Writing | Arthur Conan Doyle | Characters |
| Production | Frank Caffey | Associate Producer |
| Directing | Norman I. Cohen | Assistant Director |
| Directing | Louis A. Stroller | Assistant Director |
| Sound | Nathan Boxer | Sound Mixer |
| Sound | Al Nahmias | Sound Editor |
| Sound | Sanford Rackow | Sound Editor |
| Sound | Dick Vorisek | Sound Re-Recording Mixer |
| Crew | M. James Arnett | Stunt Coordinator |
| Directing | Barbara Rittenberg | Script Supervisor |
