达特穆尔监狱的一名被定罪的小偷将被盗的英格兰银行印版的位置藏在三个音乐盒内。当这些盒子的无辜购买者开始被谋杀时，福尔摩斯和华生展开了调查。
Basil Rathbone
Sherlock Holmes
Nigel Bruce
Dr. John H. Watson
Patricia Morison
Mrs. Hilda Courtney
Frederick Worlock
Colonel Cavanaugh
Harry Cording
Hamid
Carl Harbord
Inspector Hopkins
Holmes Herbert
Ebenezer Crabtree
Edmund Breon
Julian 'Stinky' Emery
Patricia Cameron
Evelyn Clifford
Mary Gordon
Mrs. Hudson
Ian Wolfe
Commissioner of Scotland Yard
Leyland Hodgson
Tour Guide
Marjorie Bennett
Antique Shop Assistant (uncredited)
William H. O'Brien
Detective at Murder Scene
