House of Many Ways by Diana Wynne Jones

reached the desk, it was almost bright as daylight in there. Charmain shoved aside Das Zauberbuch and picked up the bundle of letters underneath. She had to check. If Peter was telling the truth, one of the letters asking to be Great-Uncle William’s apprentice had to be from him. Because she had only skimmed through thembefore, she had no memory of seeing one, and if there wasn’t one, she was dealing with an imposter, possibly another lubbock. She had to know.
    Ah! Here it was, halfway down the pile. She put her glasses on and read:
    Esteemed Wizard Norland,
    With regard to my becoming your apprentice, will it be convenient for me to arrive with you in a week’s time, instead of in the autumn as arranged? My mother has to journey into Ingary and prefers to have me settled before she leaves. Unless I hear from you to the contrary, I shall present myself at your house on the thirteenth of this month.
    Hoping this is convenient,
    Yours faithfully,
    Peter Regis
    So that seems to be all right! Charmain thought, half relieved and half annoyed. When she hadskimmed the letters earlier, her eye must have caught the word apprentice near the top and the word hoping near the bottom, and those words were in all the letters. So she had assumed it was just another begging letter. And it looked as if Great-Uncle William had done the same. Or perhaps he had been too ill to reply. Whatever had happened, she seemed to be stuck with Peter. Bother! At least he’s not sinister, she thought.
    Here she was interrupted by dismayed yelling from Peter in the distance. Charmain hastily stuffed the letters back under Das Zauberbuch, snatched off her glasses, and dived out into the corridor.
    Steam was blasting out of the bathroom, mixing with the bubbles that had strayed in there. It almost concealed something vast and white that was looming toward Charmain.
    “What have you d—” she began.
    This was all she had time to say before the vast white something put out a gigantic pink tongue and licked her face. It also gave out a huge trumpeting sound. Charmain reeled backward. It was like beinglicked by a wet bath towel and whined at by an elephant. She leaned against the wall and stared up into the creature’s enormous, pleading eyes.
    “I know those eyes,” Charmain said. “What has he done to you, Waif?”
    Peter surged out of the bathroom, gasping. “I don’t know what went wrong,” he gasped. “The water didn’t come out hot enough to make tea, so I thought I’d make it hotter with a Spell of Enlargement.”
    “Well, do it backward at once,” Charmain said. “Waif’s the size of an elephant.”
    Peter shot the huge Waif a distracted look. “Only the size of a carthorse. But the pipes in here are red hot,” he said. “What do you think I should do?”
    “Oh, honestly !” Charmain said. She pushed the enormous Waif gently aside and went to the bathroom. As far as she could see through the steam, boiling water was gushing out of all four taps and flushing into the toilet, and the pipes along the walls were indeed glowing red. “Great-Uncle William!” sheshouted. “How do I make the bathroom water cold ?”
    Great-Uncle William’s kindly voice spoke among the hissing and gushing. “You will find further instructions somewhere in the suitcase, my dear.”
    “ That’s no good!” Charmain said. She knew there was no time to go searching through suitcases. Something was going to explode soon. “Go cold !” she shouted into the steam. “Freeze! All you pipes, go cold at once !” she screamed, waving both arms. “I order you to cool down!”
    It worked, to her astonishment. The steam died away to mere puffs and then vanished altogether. The toilet stopped flushing. Three of the taps gurgled and stopped running. Frost almost instantly formed on the tap that was running—the cold tap over the washbasin—and an icicle grew from the end of it. Another icicle appeared on the pipes that ran across the wall and slid, hissing,