 A young couple, Cassie and David Osborne, have an intense argument as he spends too much time on business trips.The next morning, after David goes to work, Cassie takes their five-year-old daughter Samantha to stay with her sister, Joanne, for a few days.Having car trouble, they stop at a seedy-looking gas station, where they are tended to by Roy Scudder, the owner.