In the city-state of Geath, the King lives in a golden hall, and the people want for nothing. Everyone is happy and everyone is rich. When the Doctor and Amy look beneath the surface, they discover a city of secrets. At the heart of the hall, a great metal dragon oozes gold. Then the Herald appears, demanding the return of her treasure. And next come the gunships. The battle has begun, and only the Doctor and Amy can save the people of the city from being destroyed in the crossfire.