When Becca and Tyler are sent to their grandparents' secluded Pennsylvania farm for a weeklong stay, they quickly discover something is not right with the elderly couple. Faced with strange rules and increasingly frightening behavior, the children soon realize it will take all their wits to make it home alive.

Following the loss of their son, retired sheriff George Blackledge and his wife Margaret leave their Montana ranch to rescue their young grandson. When they discover that he is in the clutches of a dangerous family living off the grid in the Dakotas, George and Margaret must fight for the survival of their family.