One night, in the dim darkness of his room, Moin heard something shuffling and sniffling under his bed. . .

It is a monster. Moin has to learn to live with the monster, which does nothing but eat bananas, sing silly songs and try out new hairstyles.

However, keeping the monster a secret from his parents and teachers is a tough task and finally Moin decides that the only thing to do is send the monster back where it came from