Brotherhood of the Fallen. White Haven Hunters, #7

There are worse things than death. Belial has been proving it for millennia. Black Cronos is finished. But something far older has been watching from the shadows all along. When Shadow and the Nephilim track one of Belial's agents to a thirteenth-century church in Florence, what they find in the crypt is a trap built specifically for Nephilim. Four brothers on their knees, powerless, as a Fallen Angel's corrupting jewels fill the room with ancient, malevolent power.
Only Shadow - fey, untouched by angelic magic, and very angry - stands between them and Belial's reach. But Florence is just the beginning. Belial has spent centuries building his network through sacred sites, loyal disciples, and jewels that carry his power to spread madness and destruction. His agents are scattered across Europe, his manifesto is terrifyingly organised, and his influence runs deeper than anyone feared.
With Barak and Estelle closing in on his stronghold, JD finally unlocking the Emerald Tablet's secrets, and Nahum facing the most personal stakes of his life, the team has never been more committed - or more vulnerable. The epic finale of the White Haven Hunters urban fantasy series - Nephilim, fey, witches, and a Fallen Angel who has been waiting centuries for this fight.