Eight-year-old Jack and his younger sister Annie use the magic treehouse to travel back to the Middle Ages, where they explore a castle and are helped by a mysterious knight.
In order to support her family and maintain their ancient castle in Lesser Hoo, seventeen-year-old Althea bears the burden of finding a wealthy suitor who can remedy their financial problems.
Sophie, an eighteen-year-old girl turned into an old woman by the Witch of the Waste, takes shelter at the giant, moving castle owned by the handsome wizard Howl and makes a deal with Calcifer, a fire demon held at the castle b