"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...

Hoping to recoup his losses after answering a misdirected letter to Sherlock Holmes, barrister Reggie Heath represents a limousine driver who has been accused of murdering two tourists, a case that is complicated by a letter from a descendant of Professor Moriarty.

"This ingenious puzzle book puts you in control of your own interactive adventure. You'll be taking the role of Sherlock Holmes, the world's most brilliant detective. Your mission: to retrieve the stolen Musgrave Diamond, and thwart criminal mastermind Moriarty's diabolical sheme! Use your observation and logic skills to uncover clues. Then choose the correct answer from the selection of options to progress through the story in a race against time....