Soul Taker (Soul Taker #2)

Amarantha is the last of her kind, the Nehmer, a race that fed upon the life forces of an unsuspecting humanity. She has maintained a comfortable lifestyle for years by trading her blood and hair samples for funds from the mysterious Magnes Corporation. Now, Magnes wants more than blood and hair; they want Amaranatha and will stop at nothing to get her. Normally, this would be her time to run, to disappear... but now it's about more than her. She's not ready to leave Rosalie, her only connection to the human world, behind.