Teenager Lewis Hoxworthy discovers a disturbing painting in a medieval barn that excites archaeologist Neil Watson, who is excavating an ancient manor house nearby. When former rock star Jonny Shellmer is found shot in the head in Lewis's father's field and Lewis himself goes missing after contacting a man on the internet, Detective Sergeant Wesley Peterson suddenly faces one of his most intriguing cases yet. Is Jonny's death linked to Lewis's disappearance? And does Jonny's best-known song, Angel, contain a clue? It soon becomes clear to Neil that the paintinga portrayal of hell and judgment more than half a millennium oldholds the key to the mystery. As events reach a terrifying climax, Wesley has to act swiftly in order to save a young life.