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

Ottoline's attention is drawn to articles in the newspaper about burglaries in the apartments of wealthy ladies. Meanwhile, Mr Munroe notices an advert about the disappearance of pet dogs. Are these crimes connected, and who is behind them?