Haunted by nightmares and afraid of his newfound powers, Rasmus voluntarily confines himself at Apollon. Meanwhile, Simone ventures beyond the wall.

Simone meets a brother and sister living off the grid. Back at Apollon, Patrick and Fie weigh their options, and Rasmus makes a horrifying discovery.

Simone refuses to leave unless Daniel gives her the flower extract. Sten wants to test Fie's theory and threatens Rasmus to ensure his cooperation.

Simone's group approaches a camp of young survivors. Rasmus's thirst for power spirals out of control, and Martin leaves Apollon to search for Simone.

As Rasmus grows weaker, a worried Sarah asks Fie for help. Reunited, Martin and Simone begin the long trek back to Apollon.

A surprising revelation sparks new hope — but Simone and the others must ready themselves for a dangerous confrontation as Rasmus closes in.