Mo Hayder's previous novels The Devil of Nanking and The Treatment have ranked her among the most exciting and provocative thriller writers now working. In her latest, Ritual, Hayder gives us a taut, chilling tale of clandestine occult practices, New Age medicine, and the drug underground, set in a hypermodern urban landscape challenged by colliding immigrant cultures.Just after lunch on a Tuesday in April, nine feet under water, police diver Flea Marley closes her gloved fingers around a human hand. The fact that there's no body attached is disturbing enough. Even more disturbing is the discovery, a day later, of the matching hand. Both have been recently amputated, and the indications are that the victim was still alive when they were removed.