| Sidney Toler | ... | Charlie Chan | |
| Mantan Moreland | ... | Birmingham Brown | |
| Edwin Luke | ... | Eddie Chan | |
| Hardie Albright | ... | Walter Meeker | |
| Frank Reicher | ... | Harper | |
| Janet Warren | ... | Jean Kent | |
| Cyril Delevanti | ... | Roth | |
| Al Bridge | ... | Sheriff Mack (as Alan Bridge) | |
| Ralph Lewis | ... | Officer Jim Kimball | |
| Dorothy Granger | ... | Stella Graham | |
| Edith Evanson | ... | Louise Harper | |
| Joe Whitehead | ... | Dr. Samuel R. Peabody | |
| Henry Hall | ... | Inspector Godfrey | |
| Jack Ingram | ... | Lloyd Archer | |
| Danny Desmond | ... | Bellboy | |
| rest of cast listed alphabetically: | |||
| Lester Dorr | ... | Michael Strong (uncredited) | |
Directed by | |||
| Phil Rosen | |||
Writing credits | ||
| George Callahan | (original screenplay) | |
| Earl Derr Biggers | (character) | |
Produced by | |||
| James S. Burkett | .... | producer | |
Original Music by | |||
| Dave Torbett | |||
Cinematography by | |||
| Harry Neumann | (director of photography) | ||
Film Editing by | |||
| John C. Fuller | |||
Set Decoration by | |||
| Vin Taylor | |||
Production Management | |||
| William Strohbach | .... | production manager (as Wm. Strohbach) | |
Second Unit Director or Assistant Director | |||
| Eddie Davis | .... | assistant director | |
Sound Department | |||
| Tom Lambert | .... | sound recordist | |
Music Department | |||
| Edward J. Kay | .... | musical director | |
| Edward J. Kay | .... | composer: original theme (uncredited) | |
Other crew | |||
| Dave Milton | .... | technical director | |
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| Black Magic | The Chinese Ring | Charlie Chan in the Secret Service | Charlie Chan in The Chinese Cat | Dr. Renault's Secret |
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| Full cast and crew | Company credits | External reviews |
| IMDb Horror section | IMDb USA section |
This is one of the strangest Charlie Chan films I've even seen, probably because many of the suspects were so weird. That, and the building in which most of the action takes place - with all its secret and motorized panels - is odd to see.
The story: an unpopular family member-scientist, "Dr. Harper," (Frank Reicher) has developed a chemical that makes wood as strong as steel. Our government could use this, especially in time of war, so they are obviously concerned when the scientist is found murdered. They call on Charlie Chan to help solve the case and get the formula. Charlie winds up getting help from his Number Four Son "Eddie," someone I never saw in any other Chan films. He was the bespectacled "intellectual" son in the family and another likable Chan.
Anyway, someone is after the formula - for the money it could bring them - and is culprit is probably from the big family where the doctor was working. All of these people are portrayed as guilty-looking so the audience has a hard time figuring out who's the killer.
The "whodunnit" is wrapped up in the end with a gathering of everyone while Chan explains his discoveries. That was the only problem with the film: the ending was unsatisfying and bit unrealistic.