Jack wakes up in the morning before his 14th birthday to a number of strange things. He's faster, stronger, and Aunt Sophie is crying a lot. On his way to school he runs into a creepy guy with vampire teeth and an ominous message, and before the day is out Mrs. Fitcher, the principal, morphs into a hideous creature with giant bat wings. After a few detours on the way home, Jack arrives to a backyard full of zombies, a houseful of harpies, and oh, by the way, Aunt Sophie has been keeping a few secrets of her own.
Luckily, accomplished monster hunter Eva shows up to clue Jack in on his true identity and teach him how to fight - something he needs to learn quickly since Ren Lucre, the most evil monster in the world, can't wait to kill him. Little does Jack realize that his ancestors were the once-mighty Templar Knights and that he may be the very last of a heroic bloodline. He will discover whether he possesses the bravery to stand up against the monsters...and whether that alone will be enough to survive!