The Iremongers are a mean and cruel family, robust and hardworking, living in the Heaps, a vast sea of lost and discarded items.

A storm is brewing over Heap House. The Iremongers are growing restless and the whispers are getting louder. When Clod meets Lucy, a girl newly arrived from the city, everything changes. The secrets that bind Heap House together begin to unravel to reveal a dark truth that threatens to destroy Clod's world.