The Bone Cup (Archangel Chronicles #6)

Gabriel and Michael, hand in hand and leading the Brotherhood of Archangels, the Venatores, and the Archdemon Guild of Glass Knives, march into the mouth of madness to retrieve the Holy Grail with the blessings of both God and Lucifer. They cross dimensions and battle for the future of all realities: Heaven, Hell, Earth and Purgatory.

In Purgatory they are reunited with Naamah and meet her children, who are terrified of her. One of her allies is an angel, but they can’t identify the traitor. Gabriel faces his worst fear when Michael is injured and he might lose the unwavering comfort Michael embodies. If Gabriel cannot save the Holy Grail, he risks losing more than his one true love—all of creation might be destroyed along with them.