UnLondon is a nonsensical mirror version of London, inhabited by various creatures and animated items that have been discarded by the inhabitants on London. A boy named Hemi saves them from a roving pile of trash but is later shooed away by the tailor Obaday Fing who reveals that the boy is a ghost who was trying to get close enough to them to possess one of them. In conversation he realises that Zanna is the "Shwazzy," a prophesied chosen one who is destined to save UnLondon from the Smog – an evil, sentient cloud of pollution.