After committing a series of multiple murders, a neurologist visits an incarcerated killer, living in exile. She studies him and his brain and discovers the horror that lurks behind his violent impulses.

Based on true events, the film reimagines the emotional meltdown of Philip Tress, a Jacksonville millennial described by local media as “unable to break from a psychotic, unrequited love affair". Phil's downfall gained notoriety as his breakdown was documented by multiple recordings of calls Phillip made to a customer service agent at an international shipping company.