Chicago private investigator Michael Kelly is hired by his former partner, John Gibbons, to help solve an eight-year-old rape and battery case, a case it turns out his old friend was once ordered to forget. When Gibbons turns up dead on Navy Pier, Kelly enlists a team of his savviest colleagues to connect the dots between the recent murder and the cold case it revived: Diane Lindsay, a television reporter whose relationship with Kelly is not strictly professional; his best friend from childhood, Nicole Andrews, a forensic DNA expert; Nicole's boyfriend, Vince Rodriguez, a detective with a special interest in rape cases; and Bennett Davis from the DA's office, a friend since Kelly's days on the force. To close the case, Kelly will have to face the mob, a serial killer, his own double-crossing friends, and the mean streets of the city he loves.