Sherlock and 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 and since then she has received a pearl for every year he has not re-appeared. Now, the treasure's sender has requested a meeting and she would like Sherlock and Watson to accompany her.

Binding: Paperback;224 pages; Publisher: Ebury Publishing; Classification: Crime and mystery fiction; Weight: 278 g; Dimensions: 198 x 127 x 14

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