As an expert in insurance murders, Robin is propositioned by a mysterious, but distinguished, gentleman named Graves to kill James Clayton. The job requires an expert because Clayton has turned his country estate into an impenetrable fortress. In hopes of determining which of the dead man's three partners is the guilty one.

A notorious jewel thief turns up in New York just when a well-known jewelry shop is to open a display of some valuable gems.

Robin Scott investigates a National fraud ring which fakes personal injury claims.