Midnight Meridian - The Celestial Shadow Series, #3

The Sun is rising. The trap is set.
Mairin Cote has survived the run, but the war has followed her home. A terrifying psychic scream tears through her dreams: Highland Home is burning. The Serpent Keepers have seized The Astral Plane shop, twisting her mother's sanctuary into a dark magical battery. They are using Tawnya, the captured Sentinel, as a living power source to hunt down every last magical being in North America.
Mairin has no choice. She must return to the place where it all began. But she cannot storm the fortress alone.
Desperate and outgunned, Mairin strikes a deal with the devil: Kathryn, the Huntress. The enemy of her enemy is her only hope. Together with Jules, the reluctant sound-mage, and a dangerously unstable Mathias, Mairin leads an unholy alliance back to New England.
As the Midnight Meridian approaches—the moment of peak magical alignment—Mairin must navigate a house of horrors, confront her silenced mother, and keep her uneasy allies from killing each other. But the deepest danger lies in Mathias, whose fractured soul is beginning to remember the man he used to be, threatening to shatter the Blood Vow and unleash a chaotic power that could consume them all.
The homecoming is over. The reckoning has begun.