The House of Arden — Two impoverished children, Edred and Elfrida Arden, inherit the decrepit Arden Castle and start the search for the lost family fortune that will allow them to rebuild the castle. With the assistance of the magical Mouldiwarp, they travel back in time to earlier periods of English history, searching for clues. Harding's Luck tells the story of Dickie Harding, a little disabled boy who leaves his harsh caretaker only to take up with a traveling beggar. Dickie manages to travel back in time and meet up with the Arden family (Edred and Elfrida). Together they continue to search for the lost family treasure.
