Sign of the Four

'I crave for mental exaltation. That is why I have chosen my own particular profession, or rather created it, for I am the only one in the world.' Mary Morstan receives a large pearl through the post once a year without any clue as to the sender. When her intriguing correspondent requests a meeting, Holmes and Watson take on the case. Together the trio race through London to uncover the secrets of the Sholto family, who hold the key to uncovering the whereabouts of Mary's father and the existen ...