After two old friends accidentally meet and resolve to become investigators for hire, they quickly become embroiled in a missing treaty and a Bolshevik conspiracy.
After a businessman is found dead on a golf course, stabbed through the heart with a hat-pin, the Beresfords try to prove that the accused woman, Doris Evans, is innocent.
The new U. S. Ambassador to Britain confides to the Beresfords that on the voyage there someone substituted another travel bag for his, a bag that only contained his boots.
Scotland Yard recruits the Beresfords to infiltrate an exclusive gambling club and expose the mysterious and ruthless gang of counterfeiters operating there.
