The iron wheel began to spin, slowly at first, then faster and faster. The room grew darker. As the light lessened, so did the sound. Deeba and Zanna stared at each other in wonder. The noise of the cars and vans and motorbikes outside grew tinny ...The wheel turned off all the cars and turned off all the lamps. It was turning off London.

They are joined in their quest by a motley band of UnLondon locals, including Brokkenbroll, boss of the broken umbrellas, Obaday Fing, a couturier whose head is an enormous pincushion, and an empty milk carton called Curdle. The world of UnLondon is populated by astonishing frights and delights that will thrill the imagination.