For homicide detectives, the clock starts ticking the moment they are called into a murder investigation, and their chances of solving the case are cut in half if they can’t get a lead in the first 48 hours. Follow detectives from the nation’s top police departments in real time during these critical hours, and get behind the police tape as they work their toughest new cases, interrogate their most resistant suspects, and battle the laws of the street. Each passing hour gives suspects more time to flee, witnesses more time to forget, and crucial evidence more time to be lost. The action-packed drama returns in season 7, when Minneapolis and Tucson are added to the series’ already impressive roster of police departments, including Miami, Dallas, Cincinnati and Detroit. Will these tenacious detectives catch the killer?