Revolver

Revolver by Swierczynski, Duane. hardcover edition. ISBN: 9780316403238.

Three generations torn apart -- by bullets fired fifty years ago. Philadelphia, 1965: Two street cops -- one black, one white -- are gunned down in a corner bar. One of the fallen officers, Stan Walczak, leaves behind a 12-year-old boy, Jimmy. Philadelphia, 1995: Homicide detective Jim Walczak learns that his fathers alleged killer, Terrill Lee Stanton, has been sprung from prison. Jim stalks the ex-con, hoping to finally learn the truth. Philadelphia, 2015: Jims daughter Audrey, a forensic science student, re-opens her grandfathers murder for a research paper. But as Audrey digs deeper, she comes to realize that Stanton probably didnt pull the trigger -- and her father may have made a horrible mistake...