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

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.