Moriarty Returns a Letter

A Baker Street Mystery Brothers Reggie and Nigel Heath, charged with answering the letters to Sherlock Holmes that arrive at their 221B Baker Street law office, are back in a case that would confound even Sherlock himself. As an exhibition of vintage Sherlock Holmes letters has opened at the Marylebone Hotel, someone whom they thought was long gone ? reappears, causing a whole slew of new problems for the brothers.