George Penhaligon has only ever wanted adventure. But when he finds himself shipwrecked and alone on a mysterious island, he makes an incredible discovery. Unicorns are real - and they're bloodthirsty. Slowly, George gains one unicorn's trust and together they explore the island's magical secrets. But there is a dark presence lurking in his new home, more deadly than any unicorn. Can George fulfil his destiny and free the island from a terrible fate?