DI Amy Winter faces het toughest case yet as a serial killer couple kidnap and hunt their prey. After capture, the victims are released from an unknown location each day. But freedom does not come easily as the victim's injuries become more severe, and if they haven't escaped by day four, they won't live to see the fifth. At five months pregnant, Amy is feeling backed into a corner as the father of her child, DCI Donovan, urges her to share the news. Wen a call comes in from the killer asking to meet Amy, Donovan intercepts and sends a decoy in her place. But while officers are concentrating on the decoy, Amy is kidnapped from outside her flat. She is the next victim, and the countdown begins. DCI Donovan is distraught as he discovers Amy is missing. When his team receives a taunting video, hi is left in no doubt of the danger Amy and his unborn child are in. As the days progress, Amy's injuries grow more severe, and her team are locked in a desperate race against time.
