When a wealthy associate dies, Harry is left a cigar box containing film clips of the 1906 San Francisco Earthquake, a cigar, and baseball cards in the will of the man who died. The cigar box also contains a message: "If you're as good a detective as you think you are, use these clues to discover the key to my success."

Harry is notified by a friend that his goddaughter is engaged to him. He discovers that the groom, Bill Merrick, is already married and terminates the engagement. The challenge now is to locate Merrick's elusive wife as he denies ever being married.