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. ---------- 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)