Holmes and Watson get involved in the case after one of Watson's friends (Edmund Breon) is killed over the musical box he bought. Holmes enters a battle of wits with Courtney who in many ways proves to be his equal...
An enjoyable little Sherlock Holmes mystery with the usual clever deductions and no small amount of suspense and tension. This was the last in the long series of Sherlock Holmes films made by Rathbone and Bruce and the series certainly went out on a high.