The Brothers Hawthorne (Inheritance Games Series #4) - Jennifer Lynne Barnes

A FAMILY SECRET . . .Grayson Hawthorne was raised as the heir apparent to his billionaire grandfather, taught from the cradle to put family first. So when Grayson's half-sisters find themselves in trouble, he's determined to care of the problem - efficiently, effectively, mercilessly. And without getting emotionally involved.

AN IMPOSSIBLE CHALLENGE . . .Jameson Hawthorne is a risk-taker, a sensation-seeker, a player of games. So when his mysterious father appears and sets him a challenge, Jameson can't resist. Now he must infiltrate London's most exclusive underground gambling club, which caters to the rich and the powerful, and win an impossible game of the highest stakes. Luckily, Jameson Hawthorne lives for impossible.

HEARTS AND LIVES ARE AT STAKE . . .Drawn into twisted games on opposite sides of the globe, Grayson and Jameson - with the help of their brothers and the girl who stole both their hearts - must dig deep to decide what each of them will sacrifice to win.