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.