After single mother Tereon Grant is stabbed to death in the middle of the night, all signs point to her ex-boyfriend being the killer; then, Detectives Quinn and Velazquez dig deeper into the case, uncovering 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.

To trained eyes, it appears as though Shaquilla Weatherspoon's killers staged the crime scene to make it look like a robbery; knowing better, Detectives Quinn and Velazquez investigate those closest to Shaquilla to find the truth.

When U.S. Air Force veteran John Ray is found beaten and stabbed to death in his apartment, the crime scene looks like a random robbery.

New mother Sparkle Rai, 21, is found strangled to death by her boyfriend who instantly becomes the prime suspect; David Quinn and Vince Velazquez uncover a surprising new suspect from Rai'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 was flirting with two different women, one with an armed boyfriend. With at least three potential suspects, the detectives get to work.

Neighborhood 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.

Cassandra Bryant, 38, is found naked and barely clinging to life; she dies in the ambulance before identifying her attacker, leaving Quinn and Velazquez to find her killer.

When Detectives Quinn and Vince investigate the shooting of Antwan Curry, they find a trail of blood leading away from the murder scene; they set out to find the injured person, not knowing if they're looking for another victim or the killer.

Longtime partners Quinn and Velazquez are chosen to solve the case of Apriel Allen, a woman who was murdered in her apartment two years prior; the detectives begin with a clean slate and hope to bring some peace to Allen's loved ones.

After immigrant Mamadou Berry is murdered, Quinn and Velazquez seek to find his killer; the yearlong investigation pits the detectives against the International Robbin Crew, a ruthless and deadly Atlanta gang.

After a homeless man is shot and killed, Quinn and Velazquez assume it's a simple case; after reports come back matching the murder scene to other ongoing murder cases, the detectives realize they're on the trail of a serial killer.

Two assailants attempt to rob a man's house on a hot summer night; as events unfold, a simple robbery ends with the murder of a young couple.

When elderly Edward, who always pays his rent on time, fails to do so, the apartment manager calls in a welfare check. As it turns out, Edward has been tortured and murdered in his apartment.

Demetrius Robbins is a husband and father who always puts his family first, then the unthinkable happens; David Quinn and Vince Velazquez investigate, coming to the realization that Robbins has fallen victim to an unspeakably horrific crime.

Days pass and no one sees or hears from Jimmie Atkins; Atlanta police find Atkins murdered in his home; David Quinn and Vince Velazquez rush to the scene, only to discover a hard truth about the people who are dear to one's heart.

Ayesha Turner lives a quiet life in southwest Atlanta, then everything changes one evening; David Quinn and Vince Velazquez receive a missing person's report and begin trying to figure out what happened to Ayesha.

Carlton Benn is a great person who works for a disaster relief company, then his roommate calls police to report that Carlton is dead, and Vince and Quinn spring into action.

U.S. Navy veteran Eric Clark is a loving son, brother and husband who starts a bartending business to make some extra money; one night, Eric drives to Atlanta to pick up alcohol for an event, but this road trip will turn out to be his last.

Charles Smith is a bright young man with musical ambitions; one night, all his dreams come to an end when he is found nearly dead at a crossroads in Atlanta.

Hardworking Valerie Payton resorts to prostitution to give her son a better life, then Valerie attracts a man does the unthinkable.

Mark Schaller was new to Atlanta. While out one night, Mark began chatting with someone at a bar. Chatting quickly became something more, unfortunately it was something no one could have dreamt of.

Returning home in the early morning hours, Jerrick Jackson and his fiancé meet several assailants in their driveway, and shots are fired killing Jerrick.

Darius Bottoms, 18, leaves his friend's apartment after a fun-filled night of video games; Darius notices two figures standing near his car as he starts to drive away, then he is ambushed and shot dead.

On Sept. 13, 2010, Vince and Quinn respond to a shooting at a gas station where 19-year-old Ladeddrick Love was gunned down while his pregnant girlfriend and toddler were both in the car.