I just started reading this today. It came up in my library hold list, so I paused Contagious for this.

The Shadows (Black Dagger Brotherhood #13)
by J.R. Ward (Goodreads Author), Jim Frangione (Reading)

Two brothers bound by more than blood fight to change a brutal destiny in the heart-wrenching new novel of the Black Dagger Brotherhood by #1 New York Times bestselling author J. R. Ward.

Trez “Latimer” doesn’t really exist. And not just because the identity was created so that a Shadow could function in the underbelly of the human world. Sold by his parents to the Queen of the S’Hsibe as a child, Trez escaped the Territory and has been a pimp and an enforcer in Caldwell, NY for years- all the while on the run from a destiny of sexual servitude. He’s never had anyone he could totally rely on… except for his brother, iAm.

iAm’s sole goal has always been to keep his brother from self-destructing- and he knows he’s failed. It’s not until the Chosen Serena enters Trez’s life that the male begins to turn things around… but by then it’s too late. The pledge to mate the Queen’s daughter comes due and there is nowhere to run, nowhere to hide, and no negotiating.

Trapped between his heart and a fate he never volunteered for, Trez must decide whether to endanger himself and others- or forever leave behind the female he’s in love with. But then an unimaginable tragedy strikes and changes everything. Staring out over an emotional abyss, Trez must find a reason to go on or risk losing himself and his soul forever. And iAm, in the name of brotherly love, is faced with making the ultimate sacrifice…