The Sign of Four
, by Doyle, A. Conan- ISBN: 9781615341733 | 1615341730
- Cover: Hardcover
- Copyright: 3/30/2009
The story is set in 1887 or 1888. The Sign of Four has a complex plot involving service in East India Company India, the Indian Rebellion of 1857, a stolen treasure and a secret pact among a guard and three convicts. It presents the detective's drug habit and humanizes him in a way that had not been done in the first novel, A Study in Scarlet. It also introduces Doctor Watson's future wife, Mary Morstan.