Hendricks, equipped with her stun-gun, investigates the source and is attacked by a cloaked figure who electrocutes her to death with a defibrillator. The following day, Hendricks's body is discovered, and Franks assigns staff to interview patients about the murder. Clark is sent to the Madhouse to Cell #44, where the patient- who identifies himself as Ben London- implies the killer could be Franks. Sometime later, Clark asks Grace, the nurse in charge of medicine, about Ben's prescriptions. Grace replies that everyone in the Madhouse are on the same drugs, and Clark takes a bottle for examination. Sometime later, Clark attempts to confront Sara with some questions about the facility but is unable due to a nurse discovering Carl has hung himself. In a meeting led by Clark and Sara, Alice discusses her visions of the young boy. Afterwards, Clark witnesses Drake having sex with a patient in an open room. Waking up the next morning, Clark gets a phone call from Sara that Drake is the murderer and has been arrested by the police. Taking Ben's advice, Clark discovers that Franks has been using placebos on patients and embezzling the hospital's funding. Meanwhile, the same figure that killed Hendricks kills Dr. Morton with an axe. The next night, Clark confronts Ben again and is only told "The truth is right in front of you." Clark confides in Sara, who gives him drugged coffee that causes him to fall asleep. While dreaming, Clark is haunted by Ben's voice and visions of the little boy, before having a revelation that Sara is the killer. Clark awakens and fights the effects of the drugs long enough to get back to the Madhouse to speak to Ben, only to realize that Ben is not actually there, and that he and the small boy have been figments of Clark's imagination. It is revealed that Clark— who is in fact Ben London— was a patient in the hospital as a child, and was presumed dead when Franks hit him with his car during an escape attempt; Ben impersonated Clark, a deceased medical student, in order to infiltrate the hospital. Ben goes to Franks' office and finds him destroying evidence of his embezzlement. Ben reveals his identity to Franks before butchering him with an axe. Sara witnesses the murder and flees to the Madhouse. Once inside, she pleads with Ben for her life, but he corners