Cathy is invited for a weekend at the Devon home of Sir Cavalier Resagne, an authority on medieval costume. Steed drives her there and on the way picks her a bunch of wild flowers. At the house they are welcomed by Ola, a young girl, who says that Sir Cavaleir will not be back until later. Steed leaves to spend the weekend on the coast. By dark Sir Cavalier has not returned and Ola insists that Cathy eats without him. After taking a phone call, Ola says she has to visit a friend in the village and Cathy asures her that she doesn't mind being alone. When Ola has left strange things are happening in the house. "The joker" (Emma Peel colour) is a remake of this episode.