It is freezing mid-winter on Exmoor, and in a close-knit community where no stranger goes unnoticed, a local woman has been found murdered in her bed. This is local policeman Jonas Holly's first murder investigation. But he is distracted by anonymous letters, accusing him of failing to do his job. Taunted by the killer and sidelined by his abrasive senior detective, Jonas has no choice but to strike out alone on a terrifying hunt . . . but who is hunting who?