The dragon prince

"Learning magic is no easy thing, even for young Claudia. Despite a bit of help from a book of spells created by Kpp'Ar, her father's former mentor, it's all she can do to keep things from blowing up in her face-- often with spectacularly messy results. But a spell book isn't the only thing that Kpp'Ar left behind when he suddenly and mysteriously vanished. In his wake stands the Puzzle House, a bizarre tower full of magical traps, tricks, contraptions, and--what else--puzzles. Claudia is sure that the old mage left a gift for her and her brother, Soren, somewhere deep within its walls, and she is determined to find out exactly what it is"--Back cover.