Kent McCoy, a loving father and real estate agent, discovers an old clown suit in a house he is selling. Desperate to salvage his son Jack's birthday party after the hired clown cancels, Kent dons the costume and performs at the party to the delight of the children. However, when he tries to remove the suit afterwards, he finds that it is stuck. Over time, the outfit seems to fuse with his body, and his hair and facial features begin to change. Alarmed and unable to take the suit off, Kent sets out to uncover the origin of the strange costume.

Kent learns that the suit was part of an ancient costume once worn by a demon called "Cloyne," which manifests as a child-eating clown. As the transformation progresses, Kent begins experiencing disturbing behavioral changes, and his hunger grows insatiable. In his desperate search for a way to remove the costume and stop the horrifying changes, he meets Karlsson, who reveals more sinister aspects of the demonic curse. The stakes rise as Kent battles to retain his humanity and protect his family from the dark force taking over him.