The Gambler by Jordan Silver

Stefano Andros is a man with a chip on his shoulder. He’d stopped giving a dam about the world when his heart had been ripped out by tragedy as a young man. Now years later, he’s become a different man, one who wouldn’t think twice about putting a bullet in a fool for getting in his way. There was nothing left of the carefree young man he’d once been, until the night in a casino game room when he looked into the eyes of a dream.
She wasn’t supposed to be real, his dying sister had mentioned her with her last breath, but he’d never expected to one day hold her in his arms. Now he found himself face to face with a promise made long ago.
But all is not as it seems, as he finds that there’s more to the woman who was destined
to own his heart than meets the eye.