MURDER, D.C. by NEELY TUCKER (Windmill, 2015, 294pp) ∗∗∗½ Blurb: When Billy Ellison, the son of Washington, D.C.’s most influential African-American family, is found dead in the Potomac near a violent drug haven, veteran metro reporter Sully Carter knows it’s time to start asking some serious questions―no matter what the consequences. With the police unable…