Clara unexpectedly finds herself inside a horror game level called "Thorn Manor," only to discover that her boyfriend, Julian—who always claimed to be the "boss" of such levels—has become an unfamiliar and dangerous player. Faced with eerie NPCs, lethal rules, and a series of eliminations, she relies on her experience with escape rooms to search for a way to survive. As the truth gradually comes to light, she uncovers a secret capable of upending the entire game level.