After losing her mom in an accident, a teen and her father welcome a distant cousin named Sienna into their household. Hoping to claim the family as her own, the psychopathic Sienna hatches a devious plan to recreate the prom she never experienced.
After losing her mom in an accident, a teen and her father welcome a distant cousin named Sienna into their household. Hoping to claim the family as her own, the psychopathic Sienna hatches a devious plan to recreate the prom she never experienced.
