Sherlock Holmes is drawn into the case of Jack the Ripper who is killing prostitutes in London's East End. Assisted by Dr. Watson, and using information provided by a renowned psychic, Robert Lees, Holmes finds that the murders may have its roots in a Royal indiscretion and that a cover-up is being managed by politicians at the highest level, all of whom happen to be Masons.
Unfortunately the movie Murder by Decree is not yet available on HBO Max.
| Directing | Bob Clark | Director |
| Writing | Elwyn Jones | Novel |
| Writing | John Hopkins | Screenplay |
| Writing | Arthur Conan Doyle | Characters |
| Writing | John Lloyd | Novel |
| Sound | Carl Zittrer | Original Music Composer |
| Camera | Reginald H. Morris | Director of Photography |
| Editing | Stan Cole | Editor |
| Sound | Paul Zaza | Original Music Composer |
| Camera | David Wynn-Jones | Focus Puller |
| Directing | Ariel Levy | Assistant Director |
| Production | Bob Clark | Producer |
| Production | René Dupont | Producer |
| Production | Robert A. Goldston | Producer |
| Production | Len Herberman | Executive Producer |
| Production | Karen Hazzard | Casting |
| Production | Irene Lamb | Casting |
| Art | Harry Pottle | Production Design |
| Art | Denise Exshaw | Set Decoration |
| Costume & Make-Up | Judy Moorcroft | Costume Design |
| Costume & Make-Up | Colin Jamison | Hair Department Head |
| Costume & Make-Up | Peter Robb-King | Makeup Artist |
| Costume & Make-Up | Jane Royle | Makeup Artist |
| Costume & Make-Up | Jan Jamison | Assistant Hairdresser |
| Sound | Kenneth Heeley-Ray | Supervising Sound Editor |
| Production | John Davis | Production Manager |
| Production | Ted Rouse | Production Manager |
| Camera | Jimmy Turrell | Camera Operator |
| Sound | John W. Mitchell | Sound Recordist |
| Art | Peter Childs | Art Direction |
| Sound | Joe Grimaldi | Sound Re-Recording Mixer |
| Sound | David Appleby | Sound Re-Recording Mixer |
| Editing | Ian McBride | Assistant Editor |
| Sound | Patrick Drummond | Sound Editor |
| Sound | Wayne Griffin | Sound Editor |
| Sound | Dennis Drummond | Sound Editor |
| Costume & Make-Up | Peter Robb-King | Makeup Supervisor |
| Costume & Make-Up | Ron Beck | Wardrobe Supervisor |
| Production | Andy Birmingham | Production Accountant |
| Costume & Make-Up | Colin Jamison | Key Hairdresser |
| Art | Ken Pattenden | Construction Manager |
| Crew | Michael Albrechtsen | Special Effects |
| Directing | Marjorie Lavelly | Continuity |
| Lighting | Ray Meehan | Gaffer |
| Art | Andy Andrews | Property Master |
| Camera | Denis Fraser | Grip |
| Costume & Make-Up | Janet Tebrooke | Wardrobe Master |
| Camera | Terry Lewis | Best Boy Grip |
| Directing | Guy Travers | Second Assistant Director |
| Directing | Ken Goch | Second Assistant Director |
| Production | Liz Taylor | Production Secretary |
| Sound | Keith Pamplin | Boom Operator |
| Sound | Ron Butcher | Sound Engineer |
| Costume & Make-Up | Edward Morton | Wardrobe Assistant |
| Costume & Make-Up | Jan Jamison | Hair Assistant |
| Crew | Jock Kay | Scenic Artist |
| Crew | Lynda Levy | Unit Publicist |
| Camera | David Farrell | Still Photographer |
| Sound | Martin Ashbee | Assistant Sound Editor |
| Sound | Steven Cole | Assistant Sound Editor |
