Returning to America from Europe via ocean liner, notorious jewel thief Boston Blackie (Chester Morris) gets mixed up with a murder, a spy ring, and someone called The Mechanical Man. The first of Columbia's Boston Blackie series of B detective movies. I say detective because, despite Blackie being a jewel thief, he spends every movie solving crimes and helping people out. Usually he's the one accused of the crime and in order to prove his innocence, he must figure out the real culprits. Richard Lane plays Inspector Faraday, the cop forever on Blackie's trail who likes him despite their being on opposite sides of the law. Charles Wagenheim plays Blackie's sidekick Runt. George E. Stone would play the role later and was much better-suited for the part than Wagenheim. Rochelle Hudson and Constance Worth provide the pretty in this first film. The Blackie series always had lovely actresses. Fun start to a great series.