Razorblade Tears by S.A. Cosby

Neither Ike Randolph nor Buddy Lee Jenkins were accepting of their gay sons. Isiah and Derek met in college, fell in love, married, and had a three-year-old daughter, Arianna. Recently, however, Isiah and Derek were murdered and the police have no leads on the killer. Both Ike and Buddy Lee are grieving and angry, and they want justice for their boys. Both ex-cons (now with regular jobs), Ike and Buddy Lee team up--an unlikely pair, with Ike being black and Buddy Lee a southern white man, yet having their loss and regret in common. They will stop at nothing to avenge their sons deaths and make the killer pay.