Helsinki, 1945. The end of the war brings a new sense of artistic and social freedom for painter Tove Jansson. While focusing her artistic dreams on painting, the enchanting tales of the ‘Moomin’ creatures she told to scared children in bomb shelters, rapidly take on a life of their own, bringing international fame.

The forest’s police chief Gordon is about to retire and he needs to find a new assistant. Paddy, a clever mouse with a great sense of smell seems to be the right candidate. Together they have to solve Gordon’s last case – the mystery of squirrel’s missing nuts. Could it be the fox that took them? Gordon and Paddy will soon find out.