Here are nine delightfully funny stories about the citizens of Moominvalley. From Ninnys bout with invisibility to the Moomin familys first Christmas out of hibernation, these tale are sure to please fans young and old. Illustrations. Here are nine delightfully funny stories about the triumphs and tribulations of the citizens of Moominvalley. Readers will discover how the Moomin family save young Ninny from permanent invisibility, and what happens when Moomintroll catches the last dragon in the world. Some of the characters in these tales will be brand-new to Moomin fans, but there are lots of old friends to meet as well.