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.

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.