Colonel James Damery calls on Holmes when the rich and beautiful Miss Violet Merville announces her engagement to Baron Gruner, a dangerous Austrian. Gruner has persuaded Violet that he is not a killer, and Holmes has to establish the truth and foil the powerful baron.

• Arthur Conan Doyle
• John Hawkesworth
• Michael Cox

• Sophie Thompson
• Denys Hawthorne
• Vernon Dobtcheff