Darkness Dawns (Immortal Guardians #1)

RT Reviewers' Choice Award for Best Vampire Romance Nominee
In this dazzling, sensual novel, Dianne Duvall beckons readers into a world of vampires, immortals, and humans with extraordinary gifts. . .where passion can last forever, if you're willing to pay the price. . .
Once, Sarah Bingham's biggest challenge was making her students pay attention in class. Now, after rescuing a wounded stranger, she's landed in the middle of a battle between corrupt vampires and powerful immortals who also need blood to survive. Roland Warbrook is the most compelling man Sarah has ever laid hands on. But his desire for her is mingled with a hunger he can barely control. . .
In his nine centuries of immortal existence, no woman has tempted Roland as much as Sarah. But asking her to love him is impossible--when it means forfeiting the world she's always known, and the life he would do anything to protect. . .