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| Photos (see all 8 | slideshow) | Videos |
| Boris Karloff | ... | Mr. James Lee Wong | |
| Grant Withers | ... | Captain Sam Street | |
| Maxine Jennings | ... | Myra Ross, Dayton's Secretary | |
| Evelyn Brent | ... | Olga Petroff / Countess Dubois / Sophie Dome | |
| George Lloyd | ... | Detective Lt. Devlin | |
| Lucien Prival | ... | Anton Mohl, aka Baron Von Krantz | |
| John St. Polis | ... | Carl Roemer, Poison Gas Inventor | |
| William Gould | ... | Theodore Meisel, Dayton's Partner | |
| Hooper Atchley | ... | Christian Wilk, Dayton's Partner | |
| John Hamilton | ... | Simon Dayton, President Dayton Chemical Co. | |
| Wilbur Mack | ... | Russell, Dayton's Office Manager | |
| Lee Tung Foo | ... | Tchin, Wong's Servant (as Lee Tong Foo) | |
| Lynton Brent | ... | Detective Tommy | |
| Grace Wood | ... | Mrs. Carl Roemer | |
| rest of cast listed alphabetically: | |||
| Frank Bruno | ... | Lescardi, Mohl's Henchman (uncredited) | |
| Ed Cassidy | ... | Ambulance Doctor (uncredited) | |
| Wheaton Chambers | ... | Chemistry Lab Director (uncredited) | |
| Clancy Cooper | ... | Warehouse Man (uncredited) | |
| Lester Dorr | ... | Coroner (uncredited) | |
| Herbert Evans | ... | Mr. Wilk's Butler (uncredited) | |
| Dick Reinhart | ... | Dock Worker (uncredited) | |
Directed by | |||
| William Nigh | |||
Writing credits | ||
| Hugh Wiley | (characters) | |
| Houston Branch | (screenplay) | |
Produced by | |||
| William T. Lackey | .... | associate producer (as William Lackey) | |
Original Music by | |||
| Edward J. Kay | (uncredited) | ||
Cinematography by | |||
| Harry Neumann | |||
Film Editing by | |||
| Russell F. Schoengarth | (as Russell Schoengarth) | ||
Makeup Department | |||
| Gordon Bau | .... | makeup artist (uncredited) | |
Production Management | |||
| Charles J. Bigelow | .... | production manager (as C.J. Bigelow) | |
| Scott R. Dunlap | .... | executive in charge of production | |
Second Unit Director or Assistant Director | |||
| W.B. Eason | .... | assistant director | |
Sound Department | |||
| Karl Zint | .... | sound recording engineer | |
Music Department | |||
| Abe Meyer | .... | musical director (uncredited) | |
Other crew | |||
| E.R. Hickson | .... | technical director | |
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| The Black Widow | King of the Rocket Men | The Spider Returns | Bank Alarm | Daughter of the Tong |
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| Full cast and crew | Company credits | External reviews |
| IMDb Action section | IMDb USA section | Add this title to MyMovies |
Although most of the production is pretty plain, the basic mystery story in "Mr. Wong, Detective" is rather interesting, and Boris Karloff's good performance as the detective also makes it worth seeing. Karloff brought a human touch to every role that he played, and even though this is an atypical part for him, he is a believable Mr. Wong. Most of the other characters are somewhat nondescript, except for Grant Withers's abrasive police officer, and aside from Karloff the cast is nothing special, but the story itself is enough to hold your interest.
In the story, the detective must patiently solve a mystery from the slightest of clues. Some of the developments strain credibility, but if you can accept the premise, it's an interesting idea and it makes decent use of the details. There are several places where it could have been written better or edited more effectively, but the pacing is pretty good, and as it proceeds, it often gives you what you need to know in order to try to anticipate what happens next.
The climactic sequence is one of the better ones that you'll see in this kind of B-movie. The production values are lower than a Karloff feature deserves, but with a solid story and Karloff in the lead, it's definitely worth seeing.