They are the Sentinels. Three races, ancient guardians of mankind, each possessing unique abilities to protect humanity against their eternal foes: the Synestryn. Now, for one Sentinel, the only way to reclaim her forgotten past is to follow the blood.

Hope appeared out of nowhere, naked and alone, a woman without past. The only thing she knows is that she is imbued with a strange power. It's in her blood. And two men want to possess it.

One is Logan, a Sanguinar demon-fighter who needs Hope's essence to survive. As a vampire he's well-equipped to find her a like-blooded mate whose progeny could sustain his race for generations. The other is Krag, a Synestryn lord whose desire is to enslave Hope, and drain her of the lifeforce. With it he could control humanity forever.

When Hope and Logan both fall prey to Krag, a powerful desire grows between them. But is it enough to thwart their captor's diabolical plan and his demon warriors, and survive a vampire's destiny written in blood?