Wolf (Jack Caffery #7 - Mo Hayder

When a vagrant—the Walking Man—finds a dog wandering alone with the words “HELP US” written on its collar, he’s sure it’s a desperate plea from someone in trouble and calls on Detective Inspector Jack Caffery to investigate. Caffery is reluctant to get involved—until the Walking Man promises new information regarding the childhood abduction of Caffery’s brother in exchange for the detective’s help tracking down the dog’s owners. Caffery has no idea who or what he is searching for, but one thing