Savage Guardian by Eve Black

A beast by nature and attitude, Hawk is known throughout Vegas as man as hard as steel, and as deadly and determined as his road name. But those people who fear him, who loathe him and what he stands for, they don’t know what he truly desires.

He fell in love with her voice—haunting, heartbreaking, vocal sorcery. But she was a mystery, never showing her face, and living in the shadows of her own growing fame.
She can’t stay hidden forever, though. And once he finally meets the woman who owns him heart and soul, he is left hollow. She isn’t who he thought she was. She’s hiding something.
As Hawk digs deeper into her life to learn the truth, he discovers something that will change him forever. Something that will send him on a mission of life and death to save the woman he loves.
But one mistake and everything just might fall apart. So, he’ll do whatever it takes to keep his Siren safe, even if it means destroying everything she holds dear.