In Detroit, a double shooting in a vacant lot leads Lieutenant John Morell and Sergeant LaNesha Jones to an unlikely suspect—a 61 year old man. And in Dallas, Detective Eddie Ibarra must unravel the complex life of a victim riddled with bullets and dumped in a downtown park.

In Memphis, a truck fire brings Sgt. William Ashton and the homicide team to the scene of a double murder. When the smoke clears, Ashton must track down a series of suspects in pursuit of the killer. In Kansas City, Kansas, Det. Bill Michael works the murder of a woman found dead in the street. With few leads to go on, he's wondering how to find the killer when anyone could be a suspect.

In Memphis, Tennessee, a woman is brutally stabbed and left for dead in the street. When a witness comes forward with the license plate number of a van she saw driving from the scene, the homicide team must employ unique tactics to lure the suspect in. In Dallas, Texas, Detective Rick Duggan investigates the murder of an elderly man, shot inside his dental clinic. Investigators have little to work with until a woman comes into headquarters with information that seems too good to be true.

In Miami, Ricardo John catches his first case as lead detective: a young woman apparently raped and murdered in a vacant lot. In Dallas, Detectives Scott Sayers and Kenneth Penrod investigate a home invasion that left one man dead and his fianc e critically wounded. The case hangs on whether the surviving witness can identify her attackers.

A family man is shot dead inside his apartment. Detective Kim Sanders and Paul Ellzey believe that the shooter killed the wrong man. They must find the intended target before the killer does; rookie Detective Mario De Los Santos gets his first big case-- a triple homicide. He finds himself in the middle of a cycle of violence that threatens to spin out of control.

In Miami, Detective Manny Castillo is investigating a brutal double homicide. The key to the case could be a surviving third victim, who is clinging to life after being shot multiple times. In Dallas, detective PE Jones faces the ultimate whodunit when he finds the charred remains of a body in a burning car. With 35 years as a cop under his belt, Jones uses old-fashioned footwork to find justice.

In Memphis, Tennessee, Sergeant Caroline Mason takes it personally when a 75-year-old man is shot dead in her old neighborhood. In Detroit, a man is found dead behind the wheel on Interstate 96 and Sergeant Mike Russell tracks a notorious gang to find the killer.

A well-loved neighborhood investor is shot and the only eyewitness is a young girl on her way home from school. Sergeant Mitch Oliver and his team must persuade the girl's mother to let her talk to police; the murder of a homeless man appears to involve the notorious Mississippi-13 gang.

In Dallas, Detectives Bob Ermatinger and Ken Penrod investigate the murder of an unidentified young woman found shot to death at White Rock Lake. In order to identify the victim and begin tracking down her killer, the detectives must rely on the few leads they have, from a cell phone found at the crime scene to the clothes the victim was wearing.

Detective Robert Quirk is investigating a gang shooting that left two dead and four with gunshot wounds. When surveillance tapes fail to identify the shooter, detectives must rely on witnesses for information; Detective Robert Blehm is working the murder of a suburban man found dead in his pickup truck with a fist full of dollars and drugs.

A former airline executive is stabbed to death in his car. Rookie Detective Mario De Los Santos tracks two suspects and finds out that both the suspect and his victim shared promising futures-and a deadly vice.

Detective Rick Duggan must unravel the mystery of a body rolled up in a carpet and dumped on the side of a road; Detective Fernando Bosch takes it personally when a 66-year-old Cuban man is shot dead in the street.

In Miami, a man is gunned down at close range in broad daylight. Detective Freddie Ponce and his team follow a blood trail at the scene to an apartment complex, where they believe the suspect is hiding out. In Cincinnati, Detectives Doug Lindle and Matthew Thompson investigate the murder of a man shot outside his apartment. They learn that moments before the murder, the victim received a house call from a stranger. They must uncover the identity of the unexpected visitor to find the killer.