When the murderous spirit of a brutal baroness possesses the owner of Gloomsburg Castle, Tom readies his special ghost-repellent paste and Hetty concocts a plan to dispel the disgruntled royal for good.
With the fate of the world resting on the outcome of his battle against the mud-dripping minotaur, Tom's final exam is one that is certain to test his combined knowledge in the field and, if he survives, rightfully earn him his Ghosthunting Diploma.