Vince and Quinn help a new homicide detective who is investigating the brutal murder of an Atlanta woman. The new guy thinks he has evidence of a confession from a suspect, but the detectives aren't so sure.

Vince and Quinn are assigned to a year-old cold case murder of a man found shot to death in his car; after reviewing the case file again, a piece of original crime scene evidence surfaces, giving detectives a crucial clue to solve this murder.