This story occurs in a magical elementary school where enchanting events are part of everyday life. As school ends, the kids joyfully say goodbye to Ms. Clara, their kind and caring teacher. They don’t realise that a little gnome named Finn lives in the school's garden, in a charming mushroom house. Finn is like a hidden guardian, his unseen presence bringing comfort and joy, and making school more fun and educational for everyone.

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At night, when the school is empty, Finn sneaks around for some peaceful reading time. He’s always careful to avoid Mrs. Wallace, the school cat who patrols the halls. However, on nights when Finn is less careful, he ends up reading stories to Mrs. Wallace, who surprisingly enjoys listening. Together, they relish the quiet of the school after dark.