One night, a devoted father named Kent, determined to make his son's birthday party an unforgettable moment, puts on an extravagant red nose and a clown suit he finds in his attic. However, what begins as a simple act of entertainment soon turns into a nightmare. After the party ends, Kent discovers that he cannot take off the costume, and what seemed like a joke transforms into a dark mystery.
As time passes, Kent starts to experience increasingly disturbing changes. Not only does his body transform, but his personality is also affected by a terrifying force inherent to the suit. In desperation, Kent tries to seek help, but the situation only worsens, leading him on a journey filled with blood and terror as he slowly becomes a monstrous creation driven by the essence of the clown.
The decomposition of his sanity and the struggle to regain his humanity lead him to a series of chilling events where the line between man and beast blurs. His family becomes a victim of his horrific transformations, and Kent must face a chilling truth: some costumes cannot be removed, and some secrets are better left in the past. As the night thickens, the final revelation will test familial bonds and unleash unimaginable horror.