DI Jack Caffery is back on the beat in Mo Hayder's terrifying new bestseller. Police diver Flea Marley closes her gloved fingers around an amputated human hand. A day later, the matching hand is discovered. Both have been recently amputated, and the indications are that the victim was still alive when they were removed. DI Jack Caffery and Flea Marley's investigation leads them into the darkest recesses of Bristol's underworld, where drug addiction is rife, where street-kids sell themselves for a hit, and where an ancient evil lurks; an evil that feeds off the blood and flesh of others...