In Birmingham, lead Detective Mike Allison is working the murder of a man found shot in the basement stairwell of a house. Allison and his team quickly find an eyewitness and then the suspect. The case seems closed, when suddenly it unravels after the eyewitness disappears and Allison is forced to set his suspect free. A year passes, when out of the blue, the case takes a surprising turn. And in Charlotte, Lead Detective Bo McSwain and his team are trying to find the killers of a man shot behind his girlfriend's house. On scene, McSwain gets a break when four men come forward, claiming their innocence. The team believes these men are their suspects, but when they all refuse to talk, the case hits a wall. With nothing to hold them, the suspects start to leave homicide, but then McSwain makes a discovery at the crime scene, stopping one suspect in his tracks.