Zanna and Deeba are two girls leading ordinary lives, until they stumble into the world of UnLondon, an urban Wonderland where all the lost and broken things of London end up - and some of its lost and broken people too.

Stumbling through a secret entrance, Zanna and Deeba emerge in the strange wonderland of UnLondon. Here all the lost and broken things of London end up, and some of its people, too including Brokkenbroll. But the girls have arrived at a dangerous time UnLondon is under siege by the sinister Smog; it's a city awaiting its hero.