The Sign of the Four

A cryptic message. A vanished father. A deadly pact sealed in blood.

When the mysterious Miss Mary Morstan receives an anonymous letter promising to reveal the truth about her missing father, she turns to Sherlock Holmes and Dr. Watson for help. What follows is a thrilling journey through London's underworld, complete with secret alliances, exotic dangers, and a stolen treasure tied to a dark colonial past.

The Sign of the Four is the second full-length Sherlock Holmes novel, showcasing Holmes's signature deductive brilliance and Watson's growing role—not just as a partner in investigation, but in romance. It's a story of greed, betrayal, vengeance, and love—with twists that keep readers guessing until the very end.

"A riveting tale of mystery and empire, where every clue deepens the intrigue."

– The New York Times

"An essential Sherlock Holmes novel—fast-paced, atmospheric, and richly detailed."

– The Guardian

Why Readers Love It:

Holmes's mind is on full display in one of his most complex investigations

Features the beginning of Dr. Watson's love story with Mary Morstan

Combines detective fiction with adventure, treasure hunting, and betrayal

Click 'Buy Now' to uncover the mystery behind The Sign of the Four—and witness the brilliance of Sherlock Holmes in action.