The Iremongers are at large in London, the ruins of Foulsham left burning behind them. They need a new home and they intend to find one. Londoners are beginning to notice bizarre happenings in their city - loved ones disappearing, strange objects appearing and a creeping darkness that seems to swallow up the daylight. The Police have summoned help, but is their cure more deadly than the feared Iremongers? What role will Clod play: returning son or rebel? Heatbroken child or hero? And where are all the rats coming from?