Mira is flying to Pittsburgh to visit her mother for Christmas. But when a blizzard results in a canceled layover, and it looks like she might get stuck in Philadelphia, Mira hitches a ride with a group of friendly college kids who were on her initial flight. As the drive progresses and weather conditions turn more dangerous than she feared, Mira realizes that the four other passengers she’s stuck in the car with don’t actually know one another. And one of them is plotting to ensure their trip ends in deadly disaster.