The Beryl Board, a new computer processor, has been stolen from the home of Mr. Holder. Holder accuses his son, Arthur of stealing the board, which was found in his possession with apiece broken off. It is up to Holmes, Watson, and the Baker Street Irregulars to clear Arthur, and to expose the one he has been hiding.

• Sandy Ross
• Arthur Conan Doyle
• Phil Harnage

• Jason Gray-Stanford
• Viv Leacock
• Jennifer Copping