Josh collects horror comics and he loves to terrify his brother Paul and his stepsister Mandy with scary stories the more gruesome, the better. So when the three are sent to Wales to stay with Grampy Jenkins, Josh starts to spin a scary yarn about the strange Balwen Black Mountain sheep that live around Grampy"s farmhouse, and about Rhys the Fleece the legendary, devilish shepherd that guards them. He also tells of the Magic Wish of Rhys the Fleece that is granted to anyone brave enough and strong enough to stay out in the valley all night long and survive. But, as Josh, Paul and Mandy are about to discover in the cold, dark hills, the truth is usually far more horrifying than fiction ...