Lewis is cold, wet and miserable on his school residential trip in the Scottish Highlands. The last thing he expects to see is a mythical creature galloping across the bleak moorland. Unicorns aren't real... are they? Lewis and his best friend Rhona find themselves caught up in a dangerous adventure to save the world's last herd of wild unicorns. Fighting against dark forces, battling the wild landscape and harnessing ancient magic, can they rescue the legendary creatures in time?