Turner Hahn and Frank Morales work as homicide detectives for the South Side Precinct. They are two old pros in the art and science of tracking down and arresting society’s darkest predators. This time, Lieutenant Dimitri Yankovich - the command of the precinct’s second shift - hands the two detectives a couple of particularly difficult cases to solve.

Case number one involves the murder of a successful corporate lawyer, who's been found dead in his car on the third floor of a parking building. The second case is a female body, found floating face down in the river. Reported kidnapped 15 years ago, she's now lying on a mortician's slab.

Both cases turn out to be more complicated than Hahn and Morales first expected, and Lieutenant Yankovich also has a personal interest in one of the cases. But can even his two best detectives bring the killers to justice?