Full of interesting ideas about how a dragon can be the center of a campaign rather than just a powerful monster. You can treat its territory as a set of concentric zones run by oppressed peasants, monsters or magical forces, and turn a dragon-hunt into an attempt to stealthily get past the hazards created by its magic and cunning. There are even tables suggesting how the dragon's minions can react to various events and alerts, and there's info on how to roleplay a Bilbo-like encounter of riddles and groveling and how to design a dragon lair as something more planned-out than a simple cave. This book helped inspire a writing project of my own.