In search of clues to the mystery of her father's death, 16-year-old Sally Lockhart ventures into the shadowy underworld of Victorian London. Pursued by villains at every turn, the intrepid Sally finally uncovers two dark mysteries—and realizes that she herself is the key to both.

"In Dickensian fashion, Pullman tells the story of 16-year-old Sally Lockhart, who becomes involved in a deadly web of events as she searches for a mysterious ruby. The novel is a page turner, peopled with despicable hags, forthright heroes, and children living on the underbelly of 19th-century London. The story's events are exciting, with involved plotting. Settings and characterizations are exquisitely drawn. The first entry in a planned trilogy."—(starred) Booklist. Reading level: 6.7.