Beatrice is left out in the rain with a brainless horse while Wirt and Greg must ask for directions in a lively colonial tavern called "The Dark Lantern" where some surprising secrets are revealed about the Unknown.

Is millionaire Quincy Endicott's sprawling mansion haunted by a beautiful ghost, or is the tea baron going mad? Greg and Fred the Horse are on the case! Meanwhile, Wirt and Beatrice get trapped in an armoire while searching for loose change.