While traveling down a desolate road, Maria comes upon an apparently abandoned school bus. A girl has written “Help Me” in one of the windows, and Maria quickly discovers the messy secrets that lie in the back of the bus. Maria soon finds herself hidden and trapped with the girl as the killer takes them on the ride of their lives. Their journey leads to a bizarre medieval castle nestled in the desert, a location where they’ll quickly learn their enemy is not who they think. The girls must figure out whom to trust if they hope to make it home, Alive or Dead.