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...