 Christine's foster mother bids farewell to her daughter, then bludgeons a bound and gagged man with a hammer.After the party, Christine's group begins driving back to Chicago in an RV, and it is revealed that Christine has a troubled past and an unspecified mental illness, which has caused her to carve inverted crosses into her abdomen.During the trip, the quartet pick up a hitchhiker named Joe, who they quickly eject from the vehicle due to his strange behavior.