Awkward college student Luna accidentally kills her popular football-player boyfriend, Mark, hours before the massive Halloween party that she's hosting with her best friend, Frankie. What was meant to be a harmless prank ends with disastrous consequences. now the two have a dilemma: cancel the party and risk their social status, or throw the party and figure out what to do with a dead body? Already labeled as his rebound, Luna sees the party as a chance to prove her self-worth. After some hesitation, the two girls decide to go through with it anyway, disguising Mark's body as one of the decorations. As the night unfolds, Luna and Frankie, with newfound confidence, think they're finally winning over the student body, until Sara, Mark's ex-girlfriend, shows up.