Famed detective and government agent Charlie Chan is back again for this Monogram film where Charlie is trailing a suspect who may be involved with plans to steal radar equipment/secrets from our government for foreign spies and who has just killed aboard a ship. Chan and detective friend trace suspect back to a radio show and from there on Charlie helps at least three more people get killed with his investigation. This is an interesting Chan vehicle and gives Sidney Toler plenty of screen time to hone his Chan skills. Benson Fong and Mantan Moreland are back once again and lift the mundane to the amusing with their comic routines. Moreland, again, steals his scenes and gives the film a lot of vitality it would otherwise not have. I particularly like a couple of routines he does in the film with a guy he knows and neither one lets the other finish the sentence. The comic timing was first-rate! As for the mystery, it is not too terribly confusing though when the end is told no real explanation as to why and who did crimes is revealed fully. I enjoyed many of the characterizations of the show people. I thought the means of death were very inventive, and I loved the whole thing with the elevator. Very clever.