The Sign of the Four

An Apple Books Classic edition.

The methods of deduction that made Sherlock Holmes literature’s most beloved detective are at the heart of this exquisitely plotted mystery.

A short time after the suspicious disappearance of her father, Mary Morstan began receiving strange gifts. Each year, someone sends her a priceless pearl in the mail with no name attached. This year, the pearl has arrived with a note inviting her to finally meet the unknown sender—and Holmes and Watson plan to attend the rendezvous.

Before long, the pair uncover a chain of events involving betrayal, revenge, and secrets originating far away in British-controlled India. In a fascinating whodunit shaded by the expansion of the British Empire, Dr. Watson’s descriptions of Holmes’ brilliant mind in action are every bit as irresistible as the mystery itself.