On a cold, dark February morning, Chris and Leah Hills stop for coffee at an isolated service station a stone's throw from the Welsh Borders. While Leah heads inside, Chris locks the car and goes in to order their drinks. Minutes pass. Chris waits and waits, but Leah doesn't come back.
When Sergeant Mel Daley and her boss, Detective Inspector Harry Baker, arrive to begin a search for the missing woman, their investigation calls everything into question. Is she alive? Did she leave the service station with someone else? Did Leah ever even leave Norfolk? While her husband becomes more frantic, the pair begin to unravel a tangle of dark secrets from the past.