Part of the Mavenhill Classics series, this annotated edition of Arthur Conan Doyle's classic Sherlock Holmes novel presents one of the detective's most enduring adventures in a carefully curated volume designed for modern readers.

When Mary Morstan receives an unexpected invitation connected to her father's long-unsolved disappearance, she seeks the assistance of Sherlock Holmes and Dr. Watson. Their investigation uncovers a labyrinth of secrets involving a stolen fortune, hidden identities, betrayal, and murder. As Holmes follows a trail of clues across Victorian London, the mystery grows into a thrilling pursuit that tests both his powers of deduction and his understanding of human nature.

First published in 1890, The Sign of the Four deepened the Holmes mythology while introducing readers to one of the most memorable cases in detective fiction. The novel combines suspense, adventure, and psychological insight while revealing new dimensions of both Holmes and Watson.

A landmark work of detective fiction, The Sign of the Four remains an essential entry in the Sherlock Holmes canon and a fascinating portrait of mystery, consequence, and obsession.