Ultimate Warriors - Silk by Michelle M Pillow - Paid

In order to keep his secret formula from the enemy, the dying Dr. William St. James made the impossible choice. He injected the only sample of it into his daughter, killing her chance at a normal life so that an elite superhero may be born. Now, ten years later and utterly alone, Quinlan St. James is still torn between the woman she could have been and the superhero, Silk, she has become.

Nikandros is an immortal Protector, sworn to an eternity in the service of good. His is a lonely existence, one chosen long ago. Believing that Quinlan might be selling her father’s formula to the highest bidder, the Protectors send him to seduce the reclusive billionaire. However, instead of a coldhearted conspirator, he discovers a lonely woman with a heart of gold—and a secret identity. Now it’s up to him to prove her innocence without blowing his cover.