Dark Places
In Mobile, Ala., when a homeless woman is found executed in an alley and a father of five is shot dead in a desolate area, detectives rely on clues from one case to help solve the other.
More from Season 21
Episode 1
Unforgotten: Mothers and Sons
Two murders within hours of each other at the same apartment complex leave Mobile Homicide scrambling to find the culprits.
Episode 2
Money Move
Five young lives are ruined when a plan to score some easy money goes horribly wrong.
Episode 3
Deadly Bluff
In Tulsa, one man is killed, and another is injured when a dispute over stolen marijuana plants turns deadly.
Episode 4
Tripped Out
When a teenager is found shot and dumped in the street, detectives struggle to figure out who he is and where he was killed.
Episode 5
House Party
In Gwinnett County, Ga., a young man is caught in the crossfire when his 21st birthday spins out of control.
Episode 6
Deadly Pickup
When a man is found shot to death in the back of his truck, detectives hope a dating app is the key to finding his killer.
