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A treasury agent on the trail of counterfeit money confides to fellow ocean liner passenger Charlie Chan that there have been two attempts on his life

When a troupe of showgirls with their impresario and press agent vacation at a Malibu Beach resort, two of them are garroted Charlie takes on the case assisted by Number Two Son Jimmy and faithful chauffeur Birmingham Brown

Charlie discovers a scheme for the theft of government radar plans while investigating several murders

While Charlie is distracted with the birth of his first grandchild, son Jimmy impersonates his father in order to investigate a murder aboard a freighter in the harbor