I know it's a crazy plan, and you don't need to come with me. But I'm going to find the unicorns, and when I find them, I'm going to set them free. In the wild Scottish highlands, best friends Lewis and Rhona discover that the legends are true: unicorns are real creatures, darkly magical and in deadly danger. A black-hearted gamekeeper has captured the world's last herd of these incredible creatures. Can the friends rescue the wild unicorns before an ancient promise has unimagined consequences for them all?