Ribby, a 'Pussy-cat' invites a little dog called Duchess to tea with a cake made by her. Duchess hopes she will not be served mouse: she can't eat mouse, but does not want to offend. She decides to bake a ham and veal pie and swap it when Ribby leaves on an errand. However, things will not go as Duchess had hoped. Book illustrated with beautiful Potter's watercolors.