When Miles Parker walks into one of his final classes of high school, the only thing on his mind is how poorly he is about to do on a Literature quiz he didn't study for. Then, his teacher dies - and vanishes - in front of him. He thinks his day can't get any stranger.

He's wrong.

When severe weather roars into the small city of Briskwood and school is canceled for the rest of the day, Miles thinks nothing of it. Then, the rain suddenly turns red and mutates people into yellow-eyed, spike-covered creatures, hell-bent on terrorizing anything that moves. Miles soon finds himself trapped at his job, the Royal Cinema Theater, along with his best friend and a group of teenagers who can't seem to get along, even in a time of crisis.

With the blood rain cutting off access to many necessary resources, Miles and the others must use their limited supplies to fight an enemy that is much stronger than they are. The race for survival against this new, deadly species is on.