Sherlock Holmes has just uncovered the truth about the theft of a priceless ruby. The wealthy Lady Damury staged the theft and tried to frame her husband - but just as Holmes reveals the truth, Lady Damury is found murdered. Holmes deduces that this is no crime of passion, but the work of a ruthless killer with no connection to the jewel. With reports of a man in a strange, trance-like state, Holmes finds himself entangled in a dangerous game of cat and mouse with the sinister Dr Caligari
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A young woman visits Sherlock asking for help reclaiming jewels from her stepfather, but the stepfather himself also later visits Baker Street, with his account confusing the issue. Holmes and his cousin Henry Vernier tackle the ensuing family mystery. A new spin on Conan Doyle's "The Speckled Band".