There's a Monster in Our School? - Welma Abert Craft - Bog

Alex overhears the principal say, "We've created a monster," and decides he will find the monster before it harms a student. After courageously searching each classroom without finding it, he goes to the principal and asks where the monster is hiding. To his surprise, it is Alex who created the monster. He learns a lesson not to let his imagination run wild when he only hears part of an interesting conversation.