Cat Chant and Marianne Pinhoe have discovered something exciting - something truly precious, very strange, and valuable. An egg. An egg that has been hidden away in an attic for who-knows-how-many years. An egg protected by some strong 'Don't Notice' spells. An egg that Marianne gives to Cat, even though he lives at nearby Chrestomanci Castle. Chrestomanci himself, the strongest enchanter in the world, is sure to be interested in the egg - and interference from the Big Man is the last thing Marianne's family of secret rogue witches wants. But how much longer can the Pinhoes keep their secrets?