Finn Family Moomintroll (Swedish title Trollkarlens hatt) is the second in the series of Tove Jansson's Moomins books, published in 1948. Both the Austrian/Polish and the Japanese animated television series were largely based on the events of this novel. The 1961 English publication features a 'foreword' by Moominmamma, where she explains the nature of Moomins for fear that English children may not have heard of them; she also apologises for her "rottn" English. Tove Marika Jansson (August 9, 1914 – June 27, 2001) was a Finnish novelist, painter, illustrator and comic strip author. ... The Moomins are the central characters in a series of books by Tove Jansson. ...

Plot summary

Moomintroll, Sniff and Snufkin discover the Hobgoblin's Hat on a mountain-top, oblivious of its strange powers. Moomintroll hides inside the hat during a game of hide-and-seek and is temporarily transformed beyond recognition. The Moomin Family travel to the Island of the Hattifatteners, and the Moominhouse is transformed into a jungle when Moominmamma absent-mindedly drops a ball of poisonous pink perennials into the Hobgoblin's Hat. Thingumy and Bob arrive clutching a large suitcase containing the King's Ruby, which they stole from the Groke. After a court case (presided over by the Snork) the Groke agrees to exchange the ruby for the Hobgoblin's Hat. Thingumy and Bob steal Moominmamma's handbag to use as a bed, but return it when they realise how upset she is. The Moomins hold a party to celebrate, during which the Hobgoblin arrives (with a new hat) demanding the King's Ruby, to the refusal of Thingumy and Bob. To cheer himself up, the Hobgoblin grants everyone at the party a wish. Although not everyone gets exactly what they wished for, the Hobgoblin is delighted when Thingumy and Bob wish for a duplicate ruby to give him - the Queen's Ruby. The Moomins are the central characters in a series of books by Tove Jansson. ... The Moomins are the central characters in a series of books by Tove Jansson. ...