Season 4

While working a homicide at an abandoned home, Quinn and Vince discover a second body hidden inside a closet and the investigation quickly leads them on the hunt for a suspect known as Murder Man.

In a first for the detectives, Quinn and Vince must prove a young male who is found dead was actually killed in Atlanta; a bloodied eyewitness, an active kidnapping and a mystery suspect lead them to uncover a tale of deadly, good fun.

When a carjacking victim succumbs to his injuries a month later, Quinn and Vince must pick up the pieces of a botched robbery investigation; the search for a stolen SUV and a police pursuit lead the detectives to the unlikeliest of suspects.

After the lead detective is reassigned, Quinn and Vince take over a case involving a man found shot to death inside a vehicle; it takes a village to solve the case his rumors spiral into a violent confrontation.

Quinn and Vince are called to assist after a well-known Atlanta civil servant is gunned down outside his home; stakes are high as detectives piece together a timeline and chase down a mystery caller.

A mother's plea leads Quinn and Vince to begin investigating a homicide while the victim is still alive, and they must navigate a long trail of lies and misdirects before finally learning the truth.

A convenience store clerk is shot multiple times just before closing, but the twists and turns that lead to a break in the case aren't nearly as crazy as what happens after the arrest.

When a man is found dead after a violent carjacking, a surviving witness describes two suspects; fingerprints and mistaken identity lead the case in different directions; Quinn and Vince try a new tactic to identify the killer.

While parked in the driveway of a residential home, a man is shot multiple times; to solve this murder, Quinn and Vince need to locate a key witness, solve an East Point cold case, and uncover a plot for revenge.

Quinn and Vince are called to investigate the death of man found in a trap house in a suburban neighborhood; while uncovering nicknames and chasing down leads, Vince finds himself in a dangerous standoff to bring in the killer.

A casual summer morning turns deadly as a man is killed in a drive-by shooting; to solve this case, Quinn and Vince must build trust with the community and key witnesses to discover the leads they need to find the killer's true motive and identity.

Quinn and Vince are on the case when a man is found murdered in his truck in northwest Atlanta; when one eyewitness contradicts another, the detectives will have to sift through fact and fiction to bring this killer to justice.

When a detective in New York calls Atlanta Police about a case, Quinn and Vince take the call; in doing so, the detectives reopen a cold case about a woman found dead in her apartment; to catch this killer, they'll need to take a trip to New York.

A man is shot in broad daylight, and while eyewitnesses know the killer, they don't know his real name; Quinn and Vince will need to get an eyewitness to identify the killer before they can bring him in, but they still may not have the right guy.

Quinn and Vince investigate the death of a man who fell from his third-floor window, and they have a witness to the whole thing; finding the killers may prove difficult, though, especially when one of them has an alibi.

When a U.S. Veteran is found shot in the abdomen just minutes from his home, Quinn and Vince must assist detective Barker solve the murder; as the case begins to stall, though, it may take the whole neighborhood to help bring the killer in.

When Quinn and Vince get handed the cold case of an 11-year-old's murder, they start tracking down old leads to bring new light to the case; as they dig deeper, a former connection to one of the killers may be the lead they need to solve this murder.

Quinn and Vince investigate the death of a man found lying in the leaves with a gunshot wound to his torso, but as they look into it, they learn about a second victim; to find the killer, they'll have to unravel a series of carjackings and stories.

The sexual assault and murder of a 14-year-old girl in southwest Atlanta has been on ice since 1995, but a new lead sends Quinn and Vince hunting for suspects; as the leads once again cool, finding the killer may mean seeking inside help.

Quinn and Vince get a lead on Nacole's case and learn about another cold case from 2005; solving these cases proves to be a test of patience, but as retirement draws near, the detectives begin to wonder if Nacole's case will ever be solved.