Trained assassin Ivan Harris is detained by the mysterious Ravenholm Institute. He must choose to either trust Doctor Bell, who thinks he is delusional, or Lark, who wants to help him escape. The only issue: one of them may be in his head.
Ivan meets more of his fellow patients during a group therapy session, where backstories are revealed and things come to a head. A figure from Ivan's past makes an appearance.
Ivan agrees to work with Lark on an escape plan, which requires Ivan to distract the guards and endure a litany of painful procedures while Lark charts a course.
Ivan puts a team together, consisting of various patients with useful skills but troubling personalities. Doctor Bell becomes suspicious.
Ivan is forced to make a last-minute addition to the escape team, much to the dismay of the others. Final preparations are made for the impending escape.
Ivan and the escape team execute their plan, to various stages of success. An unexpected ally makes an appearance.
In order to escape, Ivan and the others must have one last showdown with Doctor Bell. A new enemy awakens.