William has just received the best present of his life. It's an old, real-looking stone and wooden model of a castle, with a drawbridge, moat, and a finger-high knight to guard the gates. It's the mysterious castle his housekeeper has told him about, and even though William is sad she's leaving, now the castle is his!William can't wait to play with it--he's certain there's something magical about the castle. And sure enough, when he picks up the tiny silver knight, it comes alive in his hand!

Sir Simon tells William a mighty story of wild sorcery, wizards, and magic. And suddenly William is off on a fantastic quest to another land and another time--where a fiery dragon and an evil wizard are waiting to do battle . . . .