After the NYPD arrests an eighteen-year-old girl for murdering her parents, she responds by thrashing and speaking in tongues like a woman possessed, leaving psychiatrist David Rothberg to determine if she's fit to stand trial.
She claims the Devil ordered her to kill but shares little else with the doctor, who finds himself simultaneously embroiled in the murder investigation of a transgender woman by a misogynistic cop.
The two cases hound David as he becomes more entangled in psychological twists only he can unravel.