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
Two pairs of long lost twin brothers experience high jinks involving a valuable ring, cases of mistaken identity, and gangsters
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
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 Birming