Girls: Riding in Cars

Emily and Simone expect a normal night out at the Cinema, but their friend Caitlyn is acting very strange. She is totally distracted and her only interest is in riding in cars with her head out the window with the wind blowing though her hair. Emily and Simone are very concerned, and for a very good reason. Caitlyn is willing to get into a car with any random driver, and she does.
Emily and Simone plan to be with Caitlyn at all times to protect her, but that proves very difficult.
Emily's brother, Luke, is enlisted to help them out and he ends up helping them much more than anyone ever imagined.