Blood Bathory: Absence of the Sun. The Guardians of Gaia, #2

Tyger tyger, burning bright.As theriomorphs in the service of Gaia, Tyr Gustavson and his lover Aaron fought against the vampires aiding the Third Reich during WWII. But even the fierceness of Tyr's tiger form couldn't save Aaron from being torn apart when a mission went horribly wrong. Lost in his pain, Tyr remained feral until he was unwillingly recalled to Gaia's service seventy years later. In the forests of the night...
When fighter pilot Adam Carson's plane was shot down, he thought the worst that could happen was being sent to a Nazi prison camp. Little did he know there were other monsters in the shadows, and one of them wanted to claim him. But refusing Elizabeth Bathory had a price. Adam was turned against his will and trapped in a coffin as punishment for his resistance. What immortal hand or eye.While hunting ghouls, Tyr and his colleagues discover Adam's prison.
Believing he could be an asset, Marielle Du Lac frees him. Adam joins the team and is drawn to Tyr, despite Tyr's hatred of vampires. When Tyr rejects Adam out of fear, Adam accepts a suicidal mission to find Thrace, the original nosferatu. If their desperate plan works, the theriomorphs could destroy not only Elizabeth, but the sire of all vampires as well. But if it fails, they could unleash a force leading to the destruction of them all.
and perhaps of Gaia herself.