After a family visit, stressed businesswoman Senga Wilson is driving with her rebellious daughter, Nat, down an ominous highway in the middle of the night. After they pick up a weird teenage hitchhiker, their journey goes awry. Nat decides to give her mom the slip and runs off with the hitchhiker at a rest stop. In a desperate search to find her daughter, Senga learns that Nat has been drawn into an evil cult.