Meet Detective David Gold. He's a third generation native of hardscrabble South Chicago. He's also one of Chicago's most decorated homicide detectives. Meet Gold's new partner, Detective A.C. Battle. He's a native of Mississippi whose family moved to Chicago to escape the Jim Crow South. He grew up in the Robert Taylor Homes, the penal colony of high rises across the Dan Ryan Expressway from Mayor Daley's house and Comiskey Park. Here's their first challenge. More than a decade after 9/11, someone is setting off fire bombs in Chicago using untraceable cell phones. An unknown group takes credit for the bombings and demands the release of Hassan Al-Shahid, a University of Chicago graduate student whose plan to set off a bomb at the Art Institute was thwarted at the last minute by Gold and his long-time partner, Paul Liszewski.