Odensfors High School is shaken to its core when Sebastian, the undisputable jock, dies in a horrific and supernatural explosion in a school corridor.

Niklas returns to school the next day to find Sebastian's best friend Tim spreading rumours about Niklas being responsible for Sebastian's death. Lisa starts having strange visions of a woman drowning in the lake.

Niklas has a nightmare about a mysterious raven-like figure and his body almost exploding like Sebastian. Niklas struggles to avoid Tim at school as rumours about him continue to spread.

After talking to Tuva about her relationship with Niklas, Ester decides to make an effort to patch things up. The students of Odensfors High School host an unofficial tribute party for Sebastian at the lake.

Lisa starts searching for her mother's old notebooks, trying to see if there is a connection between her mother's death, her visions and the being in the lake.

Days later, Tuva's death has left the community of Odensfors in deeper sorrow. Ester looks up information about the Odensfors lake on the web, trying to find information about the missing campers.