On the hottest day of summer in suburban Norway, 16-year-old Sofie (Silje Hagrim Dahl) is reluctantly tasked with babysitting her younger brother, Mads (Fredrik Mohn Frafjord), while their parents are away. Distracted by the arrival of two local teenage boys, Marius (Marcus Rix) and Sondre (Thomas Stene-Johansen), Sofie abandons her responsibilities to spend time with them at the local swimming pool and hang out. As romantic and sexual curiosity takes over, her neglect leads to severe and tragic consequences for her unchaperoned little brother.