If you grew up watching the Charlie Chan movies, this one has all the elements you remembered about them, (except for Mantan Moreland as Birmingham Brown, who's not in it) and even more. It's a puzzle movie, a who done it mystery thriller; it's full of red herrings; it quickly reveals clues and false clues; it has the comic touches and interplay of Charlie Chan and his, in this case, number two son; it has spooky scenes and music; it stages a review of all the possible suspects at the end as the real killer reveals himself. But this film also features outstanding direction and set design, high production values, great noirish and spooky photography, and a fast paced script with swift editing.
Charlie Chan (Sidney Toler) and his son Jimmy (Victor Sen Yung) are on board a clipper ship traveling from Hawaii to its landing dock at Treasure Island in San Francisco Bay. Within the first five minutes we're introduced to the villainous looking Gregory (Douglas Dumbrille) and the crux of the movie--the mystery novel that exposes a fake psychic--and then boom! The author is found dead in his seat having just received a radiogram from 'Zodiac' threatening his life.
The movie involves Charlie Chan tracking down the mysterious 'Psychic Guidance' Counselor, Dr. Zodiac, who is quickly revealed to have a false identity. A magician, Fred Rhadini (Cesar Romero), who has a magic show at the Golden Gate International Exposition on Treasure Island, is trying to expose fake spiritualists (ala Houdini). There are a couple of spooky scenes in Dr. Zodiac's house, including a séance, and another with the obligatory 'lights out' sequence, in which the killer escapes.
We don't need the commentary track to tell us (but it does) that the pace is 'lightning quick,' or that the sets of many scenes display an intentionality of fullness by the director, Norman Foster (who directed the two Davy Crockett movies for Walt Disney, as well as several 'Mr. Moto' films). For example, at Rhadini's 'Hawaiian Village' on Treasure Island (actually the Fox studio), each shot shows a richness of constant background activity (hula dancing, couples walking and talking etc.) that help push the quality of the film making to a higher rank.
In a novel ending, the murder of Dr. Zodiac is committed on the stage of Radini's act, and then, with the audience not being allowed to leave, is replayed by Chan and the police chief, who looks at the audience saying "Don't leave! The murderer might be you!" You can image how this must have struck the actual theater audience in 1939 when watching the film! But Rhadini is then attacked, so Chan uses the psychic mind reader Eve Cairo (Pauline Moore, in semi-exotic makeup) to read his own mind and reveal the killer, which Chan confirms in a demonstrative way.
There are problems, of course. It's now hard to accept or get into the stereotyped and phony Chinese accent used by the non Chinese Toler. He does a good job anyway, since he made 22 Charlie Chan movies. The fact that Charlie doesn't solve the crimes himself, but uses a mind reader is both unusual and weak: we expect Charlie to have solved it himself. And finally, it may be that the infamous (and still unidentified) Bay Area serial killer 'Zodiac' may have taken his name from this movie. We only see the Exposition as rear projection shots, except for an aerial view of Treasure Island while Chan and Jimmy are in the clipper.
Despite these shortcomings, the film is such a well made quality production that I have to give it a 7.
Note: Cesar Romero is best remembered for the 19 episodes of the campy TV 'Batman' (1966-1968), and his six 'Cisco Kid' films (1939-1941). Victor Sen Yung looks familiar since he was 'Hop Sing' on 97 episodes of the TV western 'Bonanza' (1959-1973). Pauline Moore can be seen as the heroine Sally in the serial 'King of the Texas Rangers' (1941). June Gail, as Rhadini's wife was married to Oscar Levant for 33 years (you can see them on 'The Tonight Show with Jack Paar' videos). And Douglas Fowley, the 'Chronicle' newspaper man who accompanies Chan and Rhadini throughout the movie, played the movie director in 'Singin' in the Rain' (1952).
Second note: Even better than the movie is the DVD extra 'The Real Treasure Island' with footage from the International Exposition itself. I've been working on Treasure Island for the past nine years, and it was a real pleasure to see this treasure!