In the 7th film of the "Crime Doctor" series based on the radio program, Dr. Robert Ordway is summoned to take attend a diabetic, and gives an injection of insulin taken from a bottle in the patient's pocket. The man dies and Ordway discovers that what he thought was insulin was really poison. Oops! Two other people are murdered before Ordway discovers who replaced the insulin with poison and what the motive was
Celebrated as supersleuth, Mr. Moto comes out fighting when a brutal boxing match turns into cold-blooded murder! Assisted by detective-in-training Lee Chan, Moto sets out to track down the killer based on a single ominous clue: a poisoned boxing glove! But when Moto's hunch points to a corrupt gambling syndicate, he's forced to wager his very life to unmask the culprit—or go down for the count.
Mr. Moto Heads to China on a quest for seven ancient scrolls that reveal the location of Genghis Khan's tomb—a crypt filled with fabulous treasure! But Moto isn't the only one stalking the scrolls—so is a shadowy band of thieves.
A guilt-ridden man blames himself for his wife's death and secretly pays an assassin to kill him. But then he finds out that his wife isn't dead at all.
A Japanese man claiming to be Mr. Moto, of the International Police, is abducted and murdered soon after disembarking from a ship at Port Said in Egypt.
A drifter claims the money in an old bank account. Soon he finds himself the target of two men who turn out to be the sons of the man's old partner, who is now in prison because of a conflict with him over the money in that account.
In 1834, Charles Stewart (Alan Ladd), the spoiled, dissolute son of a shipping magnate, is shanghaied aboard the Pilgrim, one of his father's own ships.
In the studio where the famous director Eric Von Berg reigns, Pierre Vanier, the male star of the film and the lover of Berg's muse, dies while rehearsing a scene.
