Sign of the Four

In this second Sherlock Holmes novel, the indomitable sleuth is visited by a woman in distress. Each year for the past six years, on the anniversary of her father''s mysterious disappearance ten years ago, Miss Mary Morstan has been receiving pearls, she knows not why or from whom. This time, her anonymous benefactor wants to meet. In the letter, he promises to reveal the mystery and to "right the...