A gay porn star's mysterious disappearance becomes an obsession for both a writer and another adult film star, leading them into dark supernatural corners that were never meant to be explored.

Featuring commentary from surviving participants, as well as other filmmakers and critics, this documentary chronicles the career of director John Boorman and the tumultuous production of his film Exorcist II: The Heretic, exploring its critical and commercial failure, how it changed the industry, and the importance of risk-taking in art.