As Apollon surrounds the base, Simone scrambles to find a cure. Rasmus's secret draws Sarah to him -- but threatens to tear the group apart.

Plagued by frightening visions, Rasmus takes his fate into his own hands. Sarah's health worsens. Jean and Lea share a tender moment.

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

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