It's just a normal day for Kayleigh, until the bus from school flips over unexpectedly. She wakes up surrounded by blood and severed limbs, but then she sees something moving. Once she gets a good look at the thing, it turns out to be,Leon, the cute and mysterious transfer everybody has been talking about. Outside, it seems like everyone had just disappeared, cars still running, stores still open, it's like the people vanished into thin air. What's going on? Soon they find out everybody's evacuated the city because the worst flood ever was coming their way, go on a journey with Kayleigh and Leon to see if they survive the flood.