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The Sign of Four was first released to magazines in 1890. It was later published in book format and is also known by the title The Sign of the Four. It is the second Sherlock Holmes novel, after A Study in Scarlet. The plot involves service in India, the Indian Rebellion of 1857, a stolen treasure, and a secret pact among four convicts (“the Four” of the title) and two corrupt prison guards... and of course, Sherlock Holmes.