The Shadows (Black Dagger Brotherhood, nr. 13)

On the run from a destiny of sexual servitude, Trez has never been able to rely on anyone...except for his brother, iAm. But as the pledge to mate the Queen's daughter comes due, Trez fears there is nowhere to run, nowhere to hide, and no negotiating. Now he must decide whether to endanger himself and others--or abandon the female he loves. When tragedy strikes and changes everything, iAm, in the name of brotherly love, is faced with making the ultimate sacrifice.