Read the first four books in the Vegas Underground Series. Set includes:

KING OF DIAMONDS (Book 1)
I WARNED HER.
I told her not to set foot in my casino again. I told her to stay away.
Because if I see her around my suite again, I’ll claim her as my own.
And once I make her mine, I’m not gonna set her free.
I’m king of the Vegas underground and I take what I want.

MAFIA DADDY (short bonus story)
SHE'S ALWAYS BEEN MINE
Don G gave me an order--find his daughter.
Straighten her out. Bring her home.
Sure--taking the mafia princess in hand will be my pleasure.

JACK OF SPADES (Book 3) 
“YOU’RE AT MY MERCY NOW, AMORE.”
Sorry, bella. You got dealt the losing hand.
Witness to a crime, you’re my prisoner now.

ACE OF HEARTS (Book 4)
THE SWEET LITTLE SONGBIRD’S IN MY CAGE NOW.
She owes the Family money. Big money. And I’m the guy
they sent to put the squeeze on her. So now she’s playing at my casino.