In a quiet, small town, 13-year-old Mike becomes concerned about mysterious activities at the local mortuary, Morningside. Following the death of his parents, Mike keeps a close eye on his older brother Jody, fearing he might also leave. Mike’s fears intensify when he witnesses the local mortician, known as the Tall Man, exhibiting superhuman strength and peculiar behavior. Intrigued and terrified, Mike begins to secretly investigate Morningside. He discovers that the Tall Man is responsible for a series of strange events and disappearances in the town. Mike's curiosity leads him to uncover bizarre phenomena, including diminutive, hooded figures and a deadly flying metallic sphere.

Mike confides in Jody and their friend Reggie, a local ice cream vendor, who are initially skeptical but soon become equally drawn into the mystery. As they dig deeper, they confront inexplicable horrors hidden within the mortuary. Mike realizes that the Tall Man's sinister motives extend far beyond the realm of the living. The trio encounters numerous shocking revelations and must use their wits and bravery to combat the unfolding nightmare that threatens their lives and sanity. The journey through the labyrinthine mortuary plunges them into an ever-deepening terror, where the line between reality and nightmare is perilously thin.