"How often have I said to you that when you have eliminated the impossible whatever remains, however improbable, must be the truth?"

Holmes and Watson have spent boring time at 221B Baker Street. One day, Miss Mary Morstan visit them. And they hear about her father's mysterious missing and six pearls sent from an anonymous benefactor. Finally, the benefactor wants to meet her, Holmes and Watson accompany her. They hear about her father's death and the treasure from him. And they decide to go with him to claim the inheritance of the treasure. But in the dark house, they meet another tragedy and a little paper with the sign of the four......

The Sign of the Four is an 1890 detective novel written by Arthur Conan Doyle. You can read the book and solve quizzes and puzzles in this game. This game will increase your power of inference and logical thinking ability.

Even though, wouldn't the most important thing be your free imagination?

Thank you.