As London falls under the hand of the Tyrant, war grips Earth as well as the magical land of Tir. The fate of both lies in the hands of five teenagers.
As Mark and Nan attempt to save the life of one of their friends in London, Penny is lost in the eerie confines of the Black Rose, where her expanding imagination is being manipulated by dark forces.
On Tir, Alan leads his Shee army towards the Tyrant's capital city, Ghork Mega, but his advance falters. As Kate flies in to help him, a heartbroken Mo fears that she is not brave enough to prevent the Tyrant from assuming full control of the Fail - the item that will allow him to cement his power forever."