Emily and Alexander arrive in Pamplona just in time for the Fiesta, but not everyone is in a party mood. Cousin Carmen's friend Rosa is very worried. She is afraid her father, El Matador, is going to get hurt in the bull ring. She also fears for her gentle pet bull, Bernardo, who has reached the age where he must take his place in the ring. Dodging the flamenco dancer's fast-moving feet and the claws of Caitano the cat, the mice help Rosa launch a daring rescue to save Bernardo. Rosa convinces her father that it's time for him retire from such a dangerous profession and live the life they've both always wanted (and Bernardo too!) on a peaceful, quiet farm.