A family's beloved country home becomes a nightmarish prison in the brilliant, terrifying seventh novel in internationally bestselling author Mo Hayder's Jack Caffery series A young girl comes across an injured dog in a park but doesn't tell anyone what the battered scrap of paper attached to its collar says: "Help us." Oliver Anchor-Ferrers is recovering from heart surgery at his grand country home when his wife discovers something horrifying in the garden, a grisly sight all too reminiscent of the tragedy that traumatized the family fifteen years ago and haunts them still. It's impossible: how could they have let that man out of prison? Meanwhile, detective Jack Caffery resolves to finally discover the true circumstances of his brother's disappearance and demands help from the one person he knows can lead him in the right direction. But that help will come at a price. Full of mind-bending twists and turns and Hayder's signature blend of psychological insight, sinister atmosphere and terrifying suspense, Wolf is a brilliant and compulsively readable masterwork from one of the world's best thriller writers.