A beautiful teenager is found naked and shot to death in a city park. With no evidence to work with, rookie detective Andre Lowe struggles to unravel the mystery. But the viciousness of her mysterious death evokes the sympathy of the entire Homicide Unit who pitch in to identify her and recreate her last hours on earth from tiny clues. The case captures the hearts of the public and with tips flooding in, the detectives work round the clock to try to find her killer/killers. When her car is discovered miles away the mystery deepens.

The Fallen Angel investigation takes homicide detectives back to the scene of the crime. As they sweep the city park for evidence, they discover a surveillance camera with vital footage of the victim's car at the time of her murder. Detective Jamael Logan investigates the brutal murder of a young woman found beaten and shot to death in an Atlanta shopping center.

After an intense interrogation, Detective Logan finally gets his suspect to confess to brutally murdering Misha Moore over $8. DNA results on the Fallen Angel rape kit match the Sprite bottle bought by the woman seen in surveillance video and the unit investigates another lead. Detective Klein investigates the murder of a 16-year-old out on a double date who gets caught in a shootout with the other woman’s jealous boyfriend.

New leads emerge in the Fallen Angel case; in the heart of Atlanta's wealthiest neighborhood, a man is brutally beaten and shot to death.

On the one-year anniversary of Bridget Shiel's brutal murder, Lowe organizes a vigil and canvass to try and generate new leads and give her family some resolution; Detective Zimbrick gets a DNA match on a 16-year-old cold case.

A DNA hit in the Bridget Shiel murder investigation identifies a compelling new suspect who was recently imprisoned for a double homicide; Benton investigates the death of a young man who was shot and killed while selling water on a hot summer day.