Young Donald Brecc lives in the boring fishing village of Montrose, Scotland. His routine takes place between the corral at home and school, until he is forced to leave everything to go and live in the lonely lighthouse of Scurdie Ness with his uncle, the mysterious Templeton Swan. Together they will discover m in a spellbook and the door will be opened a l the most incredible adventure: freeing the crew of the fearsome Irish captain Grace O'Malley.