Kai Blackwood is a ruthless and unhinged serial killer, known for his violent outbursts and chilling ability to manipulate those around him. After his capture, he is sent to Angelfall Psychiatric Institution, where he is placed under the care of psychiatrist Elizabeth Harper. Determined to understand his fractured mind, Elizabeth enters a dangerous psychological game—but what begins as professional curiosity quickly turns into something far more disturbing, as Kai develops an intense and obsessive fixation on her.