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Ottoline is a little girl who is looked after by her dear Mr Munro (a furry creature from the Norwegian swamp) while her parents travel the world. The friends love to solve difficult problems and come up with witty plans.

This time, everything goes wrong because of the lack of understanding between the friends. Mr Munroe flees to Norway to find a troll named Particularly Big Foot, while Ottoline takes a bear as his companion. How will Mr Munro's search end? Who will come to the girl's aid? And are trolls really such disgusting creatures?