When a 17-year-old girl vanishes from her family's remote vacation cabin in Minnesota, FBI Agent Tori Hunter races over icy roads to be the first on the scene. The girl's family is frantic and worried, which brings to mind Tori's memories of her own sister's disappearance. The police suspect the girl's father is involved, but Tori has doubts and finds out secrets about the "good girl" from the teenager's friends. Another missing teenager, a deadly snowstorm, and the haunting memory of her own missing sister spur Tori on a race to find these girls before it's too late.