The Huntress by Sevannah Storm

CALLIE is a sassy detective, known for her attitude and her ability to endanger her partners. While investigating a senator, she stumbles upon suck-bloods (her word) and a canister, embroiling herself in a diabolical plot older than her grandfather. Trying to stop her dying sister from an unlikely conversion, she falls for an ancient suck-blood and discovers that she’s more than human.
GABRIEL is centuries old but has withdrawn from society, preferring to spend his years avoiding vamp politics and reading ancient Greek texts. Asked to rescue Callie as a favor, he doesn’t expect her to tempt him with her scent, her delicious blood and her honor.
When another vampire abducts her, Gabe must use his allies and their skills to find her before she suffers through a conversion dooming her to an eternity of enslavement.The passion between them is potent, their love empowering as Callie learns that controlling everything won’t bring her happiness. Gabe discovers that to truly live he must lose his heart. What follows is the merging of vampire and human, of lust and love, of honor and forgiveness while preventing the suck-bloods and beasts from fighting a war they didn’t start.