Three generations - torn apart by one bullet. Philadelphia 1965: Two street cops - one black, one white - are gunned down in a robbery gone wrong. The killer is never prosecuted. One of the fallen officers, Stanislaw Walczak, leaves behind a twelve-year-old boy, Jimmy... Philadelphia 1995: Homicide detective Jim Walczak learns that his father's alleged killer, Terrill Lee Stanton, is out of prison. Walczak will be waiting, determined to squeeze the truth out of him - any way he can. Philadelphia 2015: Jim Walczak's daughter Audrey, studying forensic science in grad school, reinvestigates her grandfather's murder for her dissertation. But the deeper Audrey digs, the more she realises: the man everyone thinks killed Walczak didn't do it...And when the truth comes out, the danger's only going to grow.