Now it chanced that the King's eldest son, the Crown Prince, was lying ill in the Palace of a strange disease, which seemed to have touched his brain. For he was so restless, especially at nights, that someone had always to be with him to watch that he did himself no harm; and this state of things had gone on so long that everyone was quite worn out.
And the old housekeeper thought that it would be a good chance to get a quiet night's sleep if this capable-looking stranger could be trusted to sit up with the Prince.
So she left her at the door, and went and consulted the King; and the King came out and spoke to Katherine and he, too, was so pleased with her voice and her appearance that he gave orders that a room should be set apart in the Castle for her sick sister and herself, and he promised that, if she would sit up that night with the Prince, and see that no harm befell him, she would have, as her reward, a bag of silver Pennies in the morning.
Katherine agreed to the bargain readily, "for," thought she, "'twill always be a night's lodging for the Princess; and, forbye that, a bag of silver Pennies is not to be got every day."
So the Princess went to bed in the comfortable chamber that was set apart for her, and Katherine went to watch by the sick Prince.
He was a handsome, comely young man, who seemed to be in some sort of fever, for his brain was not quite clear, and he tossed and tumbled from side to side, gazing anxiously in front of him, and stretching out his hands as if he were in search of something.
And at twelve o'clock at night, just when Katherine thought that he was going to fall into a refreshing sleep, what was her horror to see him rise from his bed, dress himself hastily, open the door, and slip downstairs, as if he were going to look for somebody.
"There be something strange in this," said the girl to herself. "Methinks I had better follow him and see what happens."
So she stole out of the room after the Prince and followed him safely downstairs; and what was her astonishment to find that apparently he was going some distance, for he put on his hat and riding-coat, and, unlocking the door crossed the courtyard to the stable, and began to saddle his horse.
When he had done so, he led it out, and mounted, and, whistling softly to a hound which lay asleep in a corner, he prepared to ride away.