A man who has a talking mule gets a job on a newspaper, and both get mixed up in a murder trial.

Hot jewels from London make their way to New York, where they are stolen by racketeer Ed Dexter, who hides them with the help of his vivacious girlfriend, Vivian Palmer….

A Traveler’s Aid worker who delights in solving people’s problems gets mixed up with gangsters.

After experimenting on himself and becoming invisible, scientist Jack Griffin, now aggressive due to the drug’s effects, seeks a way to reverse the experiment at any cost.