Rookie detectives lead their first investigations in three cases from The First 48 archive. In Louisville, a rookie leans on video surveillance to find a convenience store killer. In Atlanta, a new detective utilizes facial recognition software to try and solve his case. And, another young investigator tackles a love triangle in Louisville.

Three cases from The First 48 where veteran homicide detectives show how it's done. In Dallas, a woman is brutally attacked and killed in her home; in Memphis, a longtime investigator needs to convince a reluctant witness to give up the triggerman in a shooting; and back in Dallas, a detective leans on his interrogation skills to solve the murder of a man shot in his doorway.