Who sends Miss Morstan boxes of pearls every year? Maybe her father, who disappeared 10 years ago? In his papers they found a drawing of a cache with the signature: “The Sign of Four.” Or is the girl being taken care of by her father’s old friend, Major Sholto, with whom they served in India and who brought back a bunch of jewelry from there? One thing is clear: there is a bloody trail leading to the treasure, which can only be attacked by finding out what the “Sign of Four” is and who these four are? Where has the favorite of the upcoming race, the Silver stallion, disappeared and who killed his trainer? Who is trying to separate the happy Munros and what terrible face appears in the window of the neighboring house? What scam did the unlucky stockbroker get involved in? And what were the mysterious guests from Russia doing in Dr. Trevelyan’s patient’s room? The famous Sherlock Holmes undertakes to answer these and other questions...