Monstra vs Irving — Stephen Manes

From the author of Be a Perfect Person in Just Three Days!, here's the monstrously hilarious tale of a battle between brother and sister:

Everybody thinks Irving's little sister is adorable. Everybody but Irving. To him, Claire is nothing but a little monster. He even calls her "Monstra."

So Irving decides to teach her a lesson. With the help of a miraculous potion called "Monster-Ade," he'll turn himself into a monster--a real one--just long enough to scare Claire silly.

But things don't quite work out the way he'd planned. And his parents begin to wonder: Just how do you handle a genuine monster in the family?