The Sign of the Four

On the anniversary of her father's strange disappearance, a young woman begins to receive a rare and valuable pearl each year from an anonymous benefactor. The second Sherlock story written by Doyle, mysteries heaped upon mysteries come into play, including a stolen treasure and a pact made among convicts and corrupt prison guards. In the process, Holmes and Dr. Watson uncover secrets that have remained hidden for years and treacheries that lead them to far off India. Readers also get to meet Dr. Watson's true love in The Signs of the Four, who he would eventually marry. The Signs of the Four is considered one of the most important and gripping of all the Sherlock Holmes stories written by Doyle.