Driving home one night stuck behind a rusty old car Gabe sees a little girl's face appear in the rear window. She mouths one word: “Daddy”. It's his five-year-old daughter Izzy. He never sees her again. Three years later Gabe spends his life on the motorway searching for the car that took his daughter even though most people believe that Izzy is dead. Fran and her daughter Alice also put in a lot of miles on the motorway. Trying to keep one step ahead of the people who want to hurt them. Because Fran knows what really happened to Gabe's daughter. And she knows what they will do if they ever catch up with her and Alice . . .