When single mother Tereon Grant is stabbed to death in the middle of the night, all signs point to her ex-boyfriend. But when detectives Quinn and Velazquez dig deeper into the case, they uncover a dark secret that changes everything.
When the skull of 11-year-old Alan Watson is found in a field, Quinn and Velazquez take the case of a murder that took place almost a decade before. Talking with Watson�s grandmother leads the detectives into the world of Atlanta gang violence.
Mother Shaquilla Weatherspoon is found murdered with her belongings scattered around her. To the trained eye, it looks like the killer staged the crime scene. The detectives investigate those closest to Shaquilla to find the truth.
When US Air Force veteran John Ray is found beaten and stabbed to death in his home, the crime scene looks like a random robbery. But Quinn and Velazquez look further into the secretive life of Ray and find that the murder was anything but random.
21-year-old new mother Sparkle Rai is found by her boyfriend strangled in their apartment. He instantly becomes the only suspect, but he swears he didn�t do it. Quinn and Velazquez investigate and uncover a surprising new suspect from Sparkle�s past.
Quinn and Velazquez are called when Jerry Heard is found dead from gunshot wounds. They learn Heard spends his nights at a local bar, and the night he was killed he made passes at two different women, one with an armed boyfriend.
Neighbourhood character Willie Bell is found naked and dead early in the morning. With nothing else to go on, Quinn and Velazquez discover that Willie was seen with two different women the night before he was found.
Detectives are sent to an apartment complex to investigate when 38-year-old Cassandra Bryant is found nude and barely clinging to life. She dies in the ambulance before she can identify her attacker, leaving it up to Quinn and Velazquez.
When Quinn and Vince investigate the shooting of Antwan Curry, they find a trail of blood leading away from the murder scene, meaning that someone else was hurt and fled. They set out to find this person, but is it another victim - or the killer?
After working together a few years, Quinn and Velazquez are chosen to take on the case of Apriel Allen, a woman who was murdered in her apartment two years prior. The detectives hope to bring some peace to Allen's family and friends.
When immigrant Mamadou Berry is horrifically murdered, Quinn and Velazquez set out to find his killer. The year-long investigation pits the detectives against the International Robbin Crew, a ruthless Atlanta gang.
The detectives take the case of a homeless man who was shot and killed, thinking it will be a simple case. However, after reports come back matching the murder scene to other ongoing cases, Quinn and Velazquez realise they�re after a serial killer.
When a middle-aged couple thwart an attempted home invasion by two armed assailants claiming to be law enforcement, unpredictable circumstances turn a simple robbery into the horrific murder of a young couple.
When an elderly man fails to pay his rent, the apartment manager calls the police to do a welfare check. When Detectives Quinn and Velazquez began to investigate, they soon realise murder is not always accomplished alone.
A wife becomes frantic when her husband doesn't pick up their children from daycare. Around the same time, detectives are called to a mysterious crime scene and piece together a case that is bigger than they ever imagined.
A master tailor hasn't reported to work for days, despite a reputation for always being on time. Detectives not only learn he has been murdered, but that his car is missing, leading them on an extensive witness hunt.
A devoted mother of two doesn't come home, leaving her family fearing for her safety. As detectives gather information, they are approached by a man claiming the woman may be deceased based on a confession he heard from a friend.
A disaster relief worker is found dead inside his own home. Detectives Quinn and Velazquez rush to the scene to see the roommate arrested. All is not as it seems as suspects begin to increase one by one.
One fateful night in 2005, a bartender picks up alcohol for an upcoming event. Hours later, he is pronounced dead from gunshot wounds. In 2008, detectives are assigned to the cold case and jump in where the investigation left off.
A young man is forced into an SUV for reasons unknown. Hours later he is found, barely alive, but he dies at a local hospital. As detectives circle suspects, they discover the killer was someone they never expected.
Valerie Payton was murdered in 1994, but with DNA technology being so new the case went cold. Ten years later, detectives look at past suspects wanted for murder. Will the detectives find the monster?
A new resident to Atlanta is found murdered in his upscale condo. Perplexed by the lack of leads, Quinn and Velazquez slowly piece together evidence about other murders in the area, and realise there is more to the case than meets the eye.
After a night out with his fiancee, a devoted husband and father is met by robbers in front of their home. As Detectives Quinn and Velazquez rush to the scene, they discover that when it comes to crime, age is nothing but a number.
Detectives Quinn and Velazquez work the high-profile case of Darius Bottoms, a nephew of Mayor Keisha Lance Bottoms. During the investigation, the detectives question whether the murder was gang-related or a case of mistaken identity.