It's a typical night in the town of Raven Brooks. Eleven-year-old Regina relaxes at home, her father and stepmother on a date while her older stepsister Pris babysits. But when an emergency alert comes over the airwaves, the two must grab their things and head out of town - a flash flood is coming, cellphone towers are down, and they are on their own. And to make things worse, a freak car accident leaves them stranded on the side of the road. Can the two young girls make it to safety before the flood? And just who is the strange figure that seems to be trailing them every step of the way?