A mother-of-two whose world is turned upside down when she agrees to let her nine-year-old daughter have a sleepover at her new best friend's house.
Cast: Denise Gough, Ambika Mod, Holliday Grainger, Jim Sturgess, Bronagh Waugh, Michael Workeye, Layo-Christina Akinlude
A flashback shows Rebecca preparing to abduct Lucia in Southern France, and in the present day, she reveals shocking news to Lucia. Meanwhile, Selma continues to investigate Elisa and discovers her dark past.
Elisa and Fred are in limbo as the police speculate that an organized criminal gang might be involved. Meanwhile, a mysterious prisoner, Marcus Turner, collects news clippings about Lucia's disappearance, and Fred's behavior is suspicious.
Elisa is late to pick up her daughter Lucia from school when Rebecca, the mother of Lucia's new friend, suggests a sleepover for the girls. When she goes to pick Lucia up the next morning, she discovers Lucia's missing.