Michael Robertson has delighted mystery readers and Sherlock Holmes aficionados everywhere with his charming and innovative Baker Street mystery series, where brothers Reggie and Nigel Heath are charged with answering letters to Holmes that arrive at their law office, located at 221B Baker Street. Now, Reggie and Nigel are back in a case that would confound even Sherlock himself. An exhibition of vintage Sherlock Holmes letters has opened at the Marylebone Hotel.

As Reggie and his beloved Laura embark on a pre-wedding trip, someone from Reggie and Nigel’s past—someone whom they thought was long gone—reappears, causing a whole slew of new problems for the brothers. Written with Robertson’s characteristic charm, Moriarty Returns a Letter is a standout mystery in a much-loved series, perfect for fans of the smash hit television shows "Sherlock" and "Elementary."