French thriller serial about a missing teenager. As the police investigate, the girl's friends and family are revealed as a suspicious set of characters, each with secrets of their own.

Lea's father Julien is in police custody for lying about his alibi and refusing to give his actual whereabouts on the night of his daughter's disappearance. Molina and Camille discover that Lea has been introduced to single-seater racing, but wonder how she managed to pay for lessons.

Julien is woken by a frantic message on his mobile phone from Lea asking him to call her. Molina and his team trace the call to the train station.

Francis Dupuis is interrogated, but he is obviously confused and unclear about details. However, when the police search his property they make a surprising and convincing discovery.

The waiting is finally over for the Morel family. Julien becomes obsessed with identifying everybody who attended the birthday party.

An apparent suicide with a long confession seemingly concludes the case, but Molina is not convinced.

A jeweller identifies the man who bought the pendant. The man is questioned, but he has an alibi. Romain is given a bag of Lea's possessions left at the race track.

Molina decides that the police have been chasing a red herring and retraces their investigation into Nicolas Barrault. A search of his possessions turns up one of Jenny's business cards with a handwritten note on the back.