This world is not ours alone. We share it with the Cuetiachtli, the Children of the Gods. The Goddess Flidais has charged the kindred of our world, the Faie, with defending us from her vindictive sister, Cailleach, whose determination to take the place of Flidais would have devastating consequences should she succeed.This world is not alone. It is one of six; each cared for by their own deity and kindred, and linked only by the vortexes, which can only be crossed by those with mixed blood: the descendants of kindred and native species.

The thrilling conclusion to the Multiverse Muddle, Demon Citadel sees the end of the journey to stop the Goddess Cailleach's reach from encompassing our world. The last stand in the fight for the freedom of the sixth world looms, and with danger lurking around every corner, every decision made by the Faie and their allies could mean the difference between survival and desolation. Can they save the Sixth World from Cailleach's tyranny?