Lords of the Underworld

Allow me to remind you about great book series called Lords of the Underworld - Long ago, twelve immortals warriors – each more dangerously seductive than the last -- stole and opened Pandora’s box, unleashing the evil from within. Now they carry that evil within themselves. Violence, Pain, Death, Disease, Disaster, Misery, Doubt, Promiscuity, Defeat, Lies, Secrets, and Wrath. When a powerful enemy returns, they will travel the world in search of a sacred relic of the gods – one that threatens to destroy them all.

And the newest book is coming out soon - The Darkest Passion - May 25th, 2010

Here's a little bit about it:

For weeks, the immortal warrior Aeron has sensed an invisible female presence. An angel--a 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?

Now, 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...

 Don't you just love that cover? And the story sounds great to ;)