When Nikolas left the only home he had ever known, it was a mouse named Miika who kept him company, and it was Miika who accompanied him on his journey to the Far North, in search of his father. But before the events of A Boy Called Christmas, this little mouse was the hero of his own story.

A Mouse Called Miika is an epic adventure story on a miniature scale. It's a tale of mice and men (and more mice). It is about one independent mouse who gets fed up with the other mice, and sets out on a quest of his own to prove that cheese exists, and learns to appreciate other creatures. It is also a tale of great love (of cheese) and great danger. And learning the lesson that, with cheese, as with life, what matters most is not how strongly you smell, but how strong you are on the inside.