| Warner Baxter | ... | Col. John Beetham | |
| Lois Moran | ... | Eve Mannering Durand | |
| Gilbert Emery | ... | Sir Frederick Bruce (as Gilbert Emory) | |
| Claude King | ... | Sir George Mannering | |
| Philip Strange | ... | Eric Durand | |
| Boris Karloff | ... | Beetham's Manservant | |
| Jamiel Hasson | ... | Sahib Hana | |
| Peter Gawthorne | ... | British Police Inspector | |
| John Rogers | ... | Alf Pornick | |
| Edgar Norton | ... | Hilary Galt | |
| Frank Finch Smiles | ... | Galt's Clerk | |
| Mercedes De Valasco | ... | Nuna | |
| E.L. Park | ... | Police Insp. Charlie Chan | |
| rest of cast listed alphabetically: | |||
| Kathrin Clare Ward | ... | Eve's Landlady (uncredited) | |
Directed by | |||
| Irving Cummings | |||
Writing credits(in alphabetical order) | ||
| Earl Derr Biggers | novel | |
| Sonya Levien | writer | |
| George Middleton | adaptation | |
| Wilbur Morse Jr. | titles (uncredited) | |
| Clarke Silvernail | writer | |
Produced by | |||
| William Fox | .... | producer (uncredited) | |
Cinematography by | |||
| Conrad Wells | |||
| Vincent J. Farrar | (uncredited) | ||
| Dave Ragin | (uncredited) | ||
Film Editing by | |||
| Alfred DeGaetano | |||
Set Decoration by | |||
| William S. Darling | |||
Costume Design by | |||
| Sophie Wachner | |||
Second Unit Director or Assistant Director | |||
| Charles Woolstenhulme | .... | assistant director (uncredited) | |
Sound Department | |||
| George P. Costello | .... | sound recordist (as George Costello) | |
Other crew | |||
| William Fox | .... | presenter | |
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| Halloween | Giro di vite | One Is Guilty | The Boy Princes: A Tragedie Most Monstrous | San Paolo |
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| Full cast and crew | Company credits | External reviews |
| IMDb Mystery section | IMDb USA section | Add this title to MyMovies |
Behind That Curtain is based on the third Charlie Chan novel written by Earl Derr Biggers. The book was fun pulp with Charlie outsmarting three rival detectives in solving the murder of a Scotland Yard detective and in turn solving two 15 year old mysteries.
The film, however, is interested in the two 15 year old mysteries and re-works the plot, so the film ends up being about Biggers' back story rather than the Chan story. Fox must not have been confident in the Chan character, perhaps because this was the first real year of sound film or they felt the audience would be more interested in the lovers and not a Chinese detective. Indeed, there is little romance in the book and the film takes liberties in changing 3 non-romantic characters in the book into a love triangle in the film.
It is rather sloppily done and the film really would be of no interest at all today, if it did not have small appearances by Boris Karloff and the Charlie Chan character. It is unfortunately a typical early sound effort and is cinematically uninteresting. Therefore the plot, which is not a mystery as the killer is revealed in the beginning, is all about the overdrawn lovers. It was probably even boring in 1929, but it qualifies as a curio today and should be viewed as such. It is interesting to see E.L. Park play Chan, albeit for five minutes and Karloff looks as menacing as ever. What cruel irony though, that no one can find "The Chinese Parrot", by the brilliant Paul Leni, nor the 4 missing Warner Oland Chans, and this is the one missing Chan that was found!!! Fate works in strange ways.