Gabriel de León has lost his family, his faith and his last hope for an end to the endless night - the Holy Grail, Dior. Only the thought of revenge keeps him going. So he and a group of loyal friends go to the war-torn heart of the realm to kill the Eternal King.

But Gabriel is wrong. Dior has survived his own death - and also rushes towards the besieged capital in the faint hope of ending the day's death forever. But the legions of the Eternal King are also getting closer and closer.

Gabriel and Dior become embroiled in a final battle that will decide the fate of the empire, but as the sun sets for what may be the last time, there is no one left to trust.

Not even each other.