Based on actual events, a college student named Jason Moss becomes fascinated by infamous serial killer John Wayne Gacy. Driven by curiosity and a desire to explore the psychology of evil, Jason corresponds with Gacy under the pretense of acquiring information for a school project. Gacy, initially apprehensive, becomes intrigued by Jason and the two develop an intense and disturbing bond. Through their letters and phone calls, Jason navigates a dark world, learning more about Gacy's twisted mind and the horrifying crimes he committed.

As Jason delves deeper, the boundary between fascination and obsession blurs. His relationships with friends and family begin to suffer as his fixation on Gacy consumes him. The tension escalates when Jason visits Gacy in prison, leading to a deeply unsettling encounter. Despite warnings from those around him, Jason's pursuit of understanding the nature of evil places him in increasingly perilous situations, bringing him face-to-face with the monstrous reality he sought to uncover.