Payback

Unbreakable
Highly trained assassin Dawn O'Shaughnessy was hard to kill–but the super healing powers she'd been born with had become almost a curse. Dawn had learned the horrifying truth behind her origins from the women of the Athena Academy, and she had vowed to help them destroy the scientist who'd made her the perfect killer. But there was a catch. The very genes that allowed Dawn to take a bullet and heal within minutes were self–destructing, and only her creator could stop the damage. Now Dawn had to choose between life and payback