 In this adventure game you play as both Sherlock Holmes and Dr. Watson as each takes turns searching for clues, interrogating suspects and talking to other characters in 19th century England. While Holmes questions the guests and investigates the crime scene, Dr. Watson will get assistance outside the mansion from Wiggins, Mrs. Hudson and others. At the end of each chapter, the player helps them make deductions in the form of a question and answer quiz. Gameplay is entirely mouse-driven, using a point-and-click interface, and inventory system.