Retired gem merchant Peter J. Martin hires detective Dan McRae to guard a large diamond which he plans to present to his daughter Ruth on her twenty-first birthday. Notorious jewel thief Gentleman Joe overpowers McRae, however, and takes his place at Ruth's party.

A story of treachery and intrigue, with the outcome of the story contingent upon a packet of "secret papers."

Doris Moore is a country girl who is conned by two crooks, Harry Leland and Pop Clark. They convince the naive girl to come with them to New York City and play the badger game on William Lake. But the intervention of Kate Fallon, who runs the gang's New York home, saves the innocent and traps the guilty. Instead of tricking Lake, Doris marries him.