The Darkest Passion (Lords of the Underworld #5)
For weeks, the immortal warrior Aeron has sensed an invisible female presence. An angel-demon-assassin has been sent to kill him. Or has she? Olivia claims she fell from the heavens, giving up immortality because she couldn't bear to harm him. But trusting - and falling for - Olivia will endanger them all. So how has this mortal with the huge blue eyes already unleashed Aeron's darkest passion?
With an enemy hot on his trail and his faithful demon companion determined to remove Olivia from his life, Aeron is trapped between duty and consuming desire. Worse still, a new executioner has been sent to do the job Olivia wouldn't...