The hit BBC series Sherlock starring Benedict Cumberbatch offers a fresh contemporary take on the original Sir Arthur Conan Doyle stories & has helped introduce a whole new generation of fans to the legendary detective. In this TV tie-in edition to the classic novel Sherlock & Dr Watson receive a visit from Mary Morsten who offers up a particularly cryptic puzzle for them to solve. Her father went missing six years ago & since then she has received a pearl for every year he has not re-appeared. Now the treasure's sender has requested a meeting & she would like Sherlock & Watson to accompany her. Finding the mystery benefactor is only the start of this adventure that puts Sherlock & Watson hot on the trail of cold-blooded killers & thieves & a lost Indian fortune.