Two siblings, Trudy and Tommy, move into their Great-Aunt's house and discover a wall painted with their family tree that transports them back into their medieval ancestor's time. There, they meet their Great-Aunt's brother Fered, who has been trapped in the medieval ages most of his life, Miss D'Alsace, who is faced with a horrendous marriage to the odious Sir Ulric, and Od, who bullies Tommy continuously.
As their challenges grow, both Trudy and Tommy find strengths within themselves to deal with their new situation and difficulties while all the time trying to return to their own time.