Jérémie Archambault starts a new life with her father and her brother, far away from the city, and gets a job as a lifeguard for the summer at the Domaine du Lac. Working at the beach is a new start for her, and she’d like to put her heavy past behind her. She joins a team of five lifeguards: Raphaëlle, Camille, Olivier, Thomas and Maxime. Rapidly, Jérémie realizes that she’s involuntarily disrupting the group dynamic.

It’s Jérémie’s first day of work … and Raphaëlle is making her life difficult! Raph holds Jérémie responsible for her boyfriend’s misfortunes. Add to that Olivier, her cabin roommate, who turns out to be hard to pin down. After a bad performance for Thomas at his swimming competition, Jérémie gets chewed out by Philippe Cinq-Mars, her boss, for having “dared” to give Thomas tips. Her first day is turning out pretty bad … until her new friends come to her rescue.

Thomas is having trouble getting over his failure at the swimming meet, which causes frictions with his girlfriend and his father. During that time, Olivier and Jérémie are getting closer. The two roommates are getting along rather well … but they’re also hiding elements of their past from each other. During that time, Camille is trying to repress an impossible love… Is it possible that she has feelings for her best friend’s boyfriend?

Jérémie, Max and Olivier have decided to enjoy their day off by going camping. It’s not the best moment because there’s a problem at the Domaine du Lac: Thomas has disappeared! Everyone is worried and looking for him. While camping, tensions run high and Jérémie, Olivier and Max’s expedition takes a wrong turn for one of them.

Thomas shows signs of life. Jérémie encourages him to face his problems. Max and Olivier, for their part, are having a falling out. The camp trip didn’t turn out like Max hoped, and he blames Olivier. Camille falls under the charms of a boy … who might not be interested in her for the right reasons.