Mystery monster

"Paige loves facts! She records interesting information in her facts journal and shares it with anyone who will listen. Wombats' poop is cube-shaped! Her street's buildings have seventy-three windows. And a boy named Penn lives next door. The two couldn't be more different. The craziest thing Paige believes is that bananas are actually berries (scientifically proven!), but Penn thinks there's a monster in the neighborhood! Paige will prove Penn wrong and that monsters aren't real, one fact at a time"--.