Ruy's father returns from the war and believes that they will now be happy. But his mother falls ill and moves to another place to be cured. Also his father must go to war again and Ruy is taken to the monastery for his education.
On a stormy night, Ruy takes refuge with his donkey Peka in the monastery chapel, to the fright of the monks. At the same time, there are rumors of Moorish bandits.
At last our friends recover the banner stolen by the pair of thieves and get the castle promised by Count Peñansurez, but it is not what Martin expected.