September, 1666 - The mortal civil war is over. But the war among the fae is still raging, and London is its battleground. There are forces that despise the Onyx Court, and will do anything to destroy it.
But now a greater threat has come, one that could destroy everything. In the house of a sleeping baker, a spark leaps free of the oven - and ignites a blaze that will burn London to the ground. For three harrowing days, the mortals and fae of the city will fight to save their home.
While the humans struggle to halt the conflagration that is devouring London street by street, the fae pit themselves against a less tangible foe: the spirit of the fire itself, powerful enough to annihilate everything in its path. Neither side can win on its own - but can they find a way to fight together?