The Tale of the Pie and the Patty-Pan (originally, The Pie and the Patty-Pan) is a children's book written and illustrated by Beatrix Potter, and published by Frederick Warne & Co. in October 1905. It tells of a cat called Ribby and a tea party she holds for a dog called Duchess. Complications arise when Duchess tries to replace Ribby's mouse pie with her own veal and ham pie, and then believes she has swallowed a small tin pastry form called a patty-pan. Its themes are etiquette and social relations in a small town. Wikipedia.