Kaius's life is turned upside down when he moves from grandmother Irene's house to live with his mother. His neighbor Nina becomes his babysitter. A new girl named Lola appears in Munkkivuori and becomes friends with Nina.

Nina and Lola's friendship grows stronger, but Nina's former friends and parents are skeptical about it.

The summer nights are warm and the youth hang out at the shopping mall. The girls live their lives to the fullest and dream of taking a gap year. Nina's brother Daniel is increasingly wary of the new resident in their home.

Daniel doesn't trust Lola, even though the others have already accepted her as part of the family. Nina finds out that Lola has been lying. The parents meet Nina's boyfriend Peten, and Ismo offers him a job as an assistant.

Nina's confirmation is approaching, and the family agrees that Lola can stay in Nina's room during that time. At the same time, the family's grandfather Kaarlo's behavior is becoming increasingly disturbing.

Nina returns from the confirmation camp and notices that Lola has changed. Lola's influence is evident everywhere: at the mall, among friends, and at home. Nina wonders what exactly happened during camp.

It's the last weekend of summer. There's a disco at Nuokkar and a band gig at Ugar. Nina's life is shattered in one evening when Lola's true nature dawns on her.

We finally find out what happened on the last night of summer. Who was the last one awake? Where did Lola go from the party and with whom?