Hekla and Freya live at Poshington Hall Farm in the Lake District.
They look like many sheep with silly smiles, beautiful woollen fleeces and horns, but they are not.
They are in fact Icelandic sheep that possess secret troll-given magical powers in their fleeces, and go on wonderful adventures.
In this book, the sheep get up to all sorts of mischief on their visit to Poshington Hall.