The Adventure of the Beryl Board (S02E07)

The Beryl Board, a cutting-edge computer processor, goes missing from Mr. Holder's home. Mr. Holder believes his son, Arthur, is the thief after the board is discovered in Arthur's room, with a piece noticeably broken. Now, it’s up to Holmes, Watson, and the Baker Street Irregulars to prove Arthur’s innocence and uncover the real culprit he’s been concealing.