A fellow doctor at the institute who collaborates with Nurse Diesel in their fraudulent scheme. He participates in framing the protagonist, helps capture Brophy, and attempts to murder a patient before being subdued by a trapdoor.
Montague directly threatens Victoria's father and opposes her investigation.
Victoria identifies Montague as part of the scheme exploiting wealthy patients, and he later helps take Arthur to the tower.
They form the central criminal partnership at the institute.
Diesel and Montague fabricate illnesses, exploit wealthy families, frame the protagonist, and arrange attacks against their opponents.
Montague benefits from the removal of a staff member who is leaving the scheme.
Montague is identified as Diesel's partner in the institute conspiracy, while Wentworth is killed after deciding to leave.
Montague exercises direct physical control over Arthur during the climax.
Montague helps take the real Arthur Brisbane to a tower where the staff intend to kill him.
Montague is involved in presenting and managing the patient's condition.
Montague takes the arriving psychiatrist to the room of the patient who believes he is a Cocker Spaniel.
Brophy's evidence directly endangers Montague.
Montague participates in capturing Brophy after the photographer helps reveal evidence about the shooting.
Norton functions as an institute subordinate assisting the antagonistic staff.
Norton is an orderly present with Montague when the real Arthur Brisbane is taken to the tower.
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