6 girls are just months away from their senior prom. They're starting their shopping and planning, from finding the perfect dress to finding the perfect date. Everthing that goes into having your perfect senior prom. Everything is going perfectly. Until 3 weeks before the big night. A new girl shows up at school. The 6 girls are having a prom prep party to show each other their dresses and shoes and finalize their plans on who is arriving with who and who's boyfriends are the designated drivers at the after party. What happens when all the girls and their boyfriends start dying after playing a stupid party game that night? Is it all just coincidence? Or is the new girl somehow killing them all one by one? Can they figure it out before they're all dead?