The Tyrant's control of the Fail has increased so much that now he threatens Earth as well as Tir. In a violently dystopic London, where Mark and Nantosueta are searching for Padraig and the Sword of Feimhin, Penny Postlethwaite, a gifted teenager, is mapping two Londons, the tormented 'City Above' and an eerie 'City Below'. On Tir, Alan's Shee army is intent on attacking Ghork Mega, the Tyrant's capital city, but obstacles obstruct his path at every turn. And in Dromenon Kate finds herself entering the Land of the Dead in her hunt for the serpent-dragon Nidhoggr. Day by day and hour by hour, the looming threat grows.