While going through the possessions of a deceased guest who owed them money, the mistress of the inn and her son find a treasure map that leads to a pirate fortune as well as great danger. Portrayal of good versus evil, as the young boy accompanies Long John Silver and his band of pirates in search of the buried treasure.

After the presumed death of their long-absent father, Edred inherits the title of Lord Arden and moves with his sister Elfrida into the decrepit family castle where they find an ancient spell that conjures up the magical Mouldiwarp and, with his help, set off on a journey through time in search of the lost Arden treasure.