The Sign of the Four (1890), also called The Sign of Four, is the second novel featuring Sherlock Holmes written by Sir Arthur Conan Doyle.
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Also contained in:
[Adventures of Sherlock Holmes](https://openlibrary.org/works/OL20624138W)
[Adventures of Sherlock Holmes](https://openlibrary.org/works/OL18191906W)
[Annotated Sherlock Holmes. 1/2](https://openlibrary.org/works/OL1518438W)
[Best of Sherlock Holmes](https://openlibrary.org/works/OL18195589W)
[Boys' Sherlock Holmes](https://openlibrary.org/works/OL8696809W)
[Celebrated Cases of Sherlock Holmes](https://openlibrary.org/works/OL16076930W)
[Complete Sherlock Holmes](https://openlibrary.org/works/OL18188824W)
[Complete Sherlock Holmes](https://openlibrary.org/works/OL14929975W)
[Illustrated Sherlock Holmes](https://openlibrary.org/works/OL1518342W)
[Original Illustrated Strand Sherlock Holmes](https://openlibrary.org/works/OL262529W)
[Sherlock Holmes: His Most Famous Mysteries](https://openlibrary.org/works/OL14930414W)
[Sherlock Holmes: The Novels](https://openlibrary.org/works/OL16018654W)
[The Sign of the Four, A Scandal in Bohemia and Other Stories](https://openlibrary.org/works/OL20630338W)
[Sign of the Four and Other Stories](https://openlibrary.org/works/OL20628655W)
[Tales of Sherlock Holmes](https://openlibrary.org/works/OL1518350W)
[Tales of Sherlock Holmes](https://openlibrary.org/works/OL1518418W)
[Works](https://openlibrary.org/works/OL16173818W)
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