Sherlock Holmes Series by Arthur Conan Doyle :A Study in Scarlet & The Sign Of Four

A Study in Scarlet and The Sign of Four are two stories in which the genius of Sherlock Holmes was first established. A Study in Scarlet introduces Dr. John Watson, Holmes partner-in-solving crimes, and takes a deep dive into the mind of the brilliant detective and his deductive skills from him. From a rocky start to a legendary partnership, this is the case where it all began. In The Sign of Four, Holmes and Watson hunt down a stolen treasure upon the insistence of one Mary Morstan - an investigation that throws the trio into a vortex involving secret pacts and mysterious messages.