In 1980, infamous serial killer Ted Bundy (Luke Kirby) was sentenced to death by electrocution. In the years that followed, he agreed to disclose the details of his crimes, but only to one man. FBI profiler Bill Hagmaier (Elijah Wood) met with the incarcerated Bundy in the hopes of understanding the psychology of the serial killer and providing closure for the victim's families. As Hagmaier delves into Bundy's dark and twisted mind, a strange and complicated relationship develops that neither man expected.