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 a near-fatal house fire, Natalie and Loughlin, a struggling married couple, are manipulated by an obsessive firefighter named Jack, who schemes to pit the couple against each other to win Natalie's affections for himself.