A young couple named Jim and Grace are in Lake Havasu for Spring Break and are looking really forward for the trip. On the way to their destination it starts to rain and Jim finds it kind of hard to see the road, but he continues to drive anyway. Jim and Grace starts talking about what they're going to do once get to the Lake Havasu.
While driving Jim looks at Grace and not paying attention almost runs over a man walking in the road. Jim panics and slams on the brakes and thinks he should offer the man a ride but Grace doesn't think it's a good idea to pick up a stranger. As the man starts walking towards them the car won't start, but once he reaches the car it starts and Jim drives off.
They stop at a gas station a couple of miles from where the man was walking and Jim goes inside to pay for the gas and Grace goes to the bathroom. While Jim is inside the gas station a man ask him if he could drop him off at a hotel nearby. Jim tells the man how he almost hit a man and didn't pick him up and the man says he did the right thing.
Grace is not happy Jim agreed to take this man to a hotel but she deals with it. Halfway down the road the man who calls himself John Rider, starts asking Jim personal questions about him and Grace, and Jim gets mad. Grace can't hear anything because she's listening to her iPod. John reaches and breaks Jim phone and Grace try to call 911 but John sees her and threaten to kill Jim. They eventually kicked the man out the car opening a door and John flies out the car.
Jim and Grace are happy the man is out their car and think they will never see him again. While on the road they pass a family and they notice in the back is John Rider they try to warn the family but they didn't understand what they were saying. Jim wrecks his car and now he and Grace has no car.
Later they find the family dead inside their car. Everywhere Jim and Grace go John finds them. They have to fight with John and he eventually kills and Jim, Grace is heartbroken and makes it her mission to get John back, and she does by killing him.