Marla Grayson (Rosamund Pike) is founder and CEO of Grayson Guardianships, who repeatedly petitions judges to grant her custody of frail, vulnerable people to prevent them from becoming a burden in their twilight years. In truth, Marla is a sharp-suited con artist, who makes her money by selling off her victims' homes once they are heavily sedated at expensive living facilities and unable to defend themselves. Marla unknowingly goes from hunter to prey when she turns up at the front door of Jennifer Peterson (Dianne Wiest) brandishing a court order.