Emily and Alexander travel to Spain, where their cousin Carmen invites to the big fiesta. Their friend Rosa is the daughter of the famous bullfighter El Matador. But he doesn't like being a bullfighter at all anymore, and would rather live in the country on a farm. Rosa has a young bull for a friend, whom she has known since she was a little girl and likes very much. When he is supposed to go to the arena for the fiesta, she decides to save him with the help of the mice.