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Cousins ​​Joonas and Tuuli find their grandfather’s old notebook in their grandmother’s city apartment, leading them onto the trail of an explosive secret.

Where do Joonas and Tuuli lose Grandfather’s notebook? And where has the big-footed creature that was moving about in the Border Forest gone?

Joonas and Tuuli return the notebook to Grandma, but are its secrets still intact? An uninvited guest is moving about the school—a guest with big feet and long claws.

Joonas and Tuuli return to the Border Forest to search for the Ring. Will they manage to find the teacher before the large and dangerous creature roaming the forest does?

An uninvited guest is still wreaking havoc at the school. It must be removed before school starts—but are Tuuli and Joonas the only ones who can catch the creature?

Will Tuuli and Joonas succeed in returning the creature that is destroying the school to where it belongs?