Sherrilyn kenyon - styxx (Macmillan)

The most highly-anticipated novel in the Sherrilyn Kenyon's Dark-Hunter series since Acheron is here-the unforgettable story of STYXX, Acheron's twin brother and one of the most powerful beings on earth. It's hard to risk your own life for someone who once tried to take yours, even when it's your own twin, and when loyalties are skewed and no one can be trusted, not even yourself, how do you find a way back from the darkness that wants to consume the entire world? One that wants to start aby devouring your very soul?