The Jade Mask
The Jade Mask is a 1945 film featuring Sidney Toler as Charlie Chan and the only appearance of Number Four Son, Eddie Chan, played by Edwin Luke, the real-life younger brother of Keye Luke, who had depicted Number One Son throughout the 1930s. Plot
Charlie Chan, along with #4 son Eddie and chauffeur, Birmingham Brown, looks into the apparent murder of an eccentric scientist in a spooky mansion. Although the scientist had been shot with a silenced pistol, further murders are committed with poison darts, with one narrowly missing Chan. Later, Chan discovers the dead scientist's huge collection of ventriloquist dummies are the key to the murders. Cast 
 Sidney Toler as Charlie Chan
 Edwin Luke as Eddie Chan
 Mantan Moreland as Birmingham Brown
 Hardie Albright as Walter Meeker
 Frank Reicher as Harper
 Janet Warren as Jean Kent
 Cyril Delevanti as Roth
 Alan Bridge as Sheriff Mack
 Dorothy Granger as Stella Graham

References

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1945 films
American black-and-white films
Charlie Chan films
Monogram Pictures films
1945 mystery films
American mystery films
Films directed by Phil Rosen
1940s American films