In Memphis, a well-loved neighbourhood investor is shot and the only eyewitness is a young girl on her way home from school. Sgt. Mitch Oliver and his team must persuade the girl's mother to let her talk to police.

In Miami, the murder of a homeless man appears to involve the notorious MS-13 gang. Detective Aguilar and his team follow a mysterious trail of graffiti that they hope will lead to the killer.