The quiet town of Leatherhead is shaken by a brutal double homicide, drawing the attention of both Scotland Yard's Inspector Lestrade and the renowned detective Sherlock Holmes, whom Dr. Watson has persuaded to take the case. As Holmes, players must uncover the truth behind the murders by gathering clues, interrogating suspects, and piecing together the evidence before the official investigation reaches its own conclusions. The race to solve the crime unfolds with the legendary detective's deductive methods at the player's disposal, set against the backdrop of a town hiding secrets beneath its respectable surface.