The Sign of Four is a 1923 British silent mystery film directed by Maurice Elvey and starring Eille Norwood, Isobel Elsom and Fred Raynham.

Holmes and Watson are called in to investigate a strange murder in South London which appears to have its roots in events in India some years before.

Previous Watson performer Hubert Willis was replaced by Arthur M. Cullin in the role as director Maurice Elvey felt that Willis was too old to woo the much younger Isobel Elsom as Mary Morstan.

[2] Norwood was unimpressed with Cullin in the role[2] although Cullin brought previous experience having played Watson to H. A. Saintsbury's Holmes in The Valley of Fear.

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