Maggie and the Monster

Every night a monster comes into Maggie’s room. She crashes into the furniture. She crawls under the table. She sits down on the chair and grumbles to herself.
“Get out of my room!” Maggie shouts, but the monster doesn’t pay any attention.
What does the monster want? Why does she keep coming into Maggie’s room? Maggie is clever and brave enough to solve the humorous mystery.