War of Blood. Warrior of Souls, #4

The Order fell first. That was the warning shot. Grigori Rasputin - ancient vampire lord, self-appointed god-in-progress - has stopped playing coy. His armies now occupy what's left of the United States, and the professionals who were supposed to stop this are gone. What's left is a ragtag militia and Sverre, trying to build an alliance out of people too smart, or too scared, to say yes. Because Grigori isn't just powerful anymore.
He's become something the world has never had to fight before - a walking apocalypse with the most lethal military on the planet at his back, and fewer and fewer reasons left to hold back. Sverre has to find a way to take him down before the last pocket of resistance gets stamped out. Otherwise "permanent vampire rule" stops being a threat and starts being Tuesday.