Mother-of-two Elisa Blix allows her nine-year-old daughter Lucia to stay over at her new best friend Josie's house. But the next day, when she goes to collect her, everyone has gone and Elisa's world is turned upside down.

Elisa and Fred are in limbo as the police speculate that an organised criminal gang might be involved. Meanwhile, a mysterious prisoner, Marcus Turner, collects news-clippings about Lucia's disappearance, and Fred's behaviour is suspicious.

In a flashback, Rebecca meticulously plans Lucia’s abduction in the South of France. Back in the present, she delivers startling news to Lucia. Meanwhile, Selma digs deeper into Elisa’s past, uncovering dark secrets.

Selma's actions trigger malicious speculation online about the desperate Elisa, who is increasingly distancing herself from Fred. Meanwhile, Nina finds herself cornered in France and prepares her escape.

Five years before Lucia's kidnapping, a series of tragic events connects Elisa and Nina, setting them on a path that ultimately leads to Lucia's kidnapping. In the present, Elisa begins a race against time.