C.S.I.: Crime Scene Investigation: Season 12

Under the direction of new boss D.B. Russell, the team tackles cases involving a wild shootout on a tram car, and a body dumped in an alleyway.

The task of solving the grisly quadruple homicide of an entire family becomes more complicated when three people confess to the crime.

A sadistic killer from Sara's past who recently got out of prison appears to have struck again, while another dead body appears to have drowned in chocolate.

The former Las Vegas mayor is shot during the grand opening of a new mob museum, and a maid is killed in the hotel room of a chauvinistic Middle Eastern prince.

Morgan's life may be in danger when an injured man, who is also a suspect in the murder of two gang members, hijacks his medivac helicopter and demands to be flown to Mexico.

The murder of a popular sideshow performer sends the team behind the scenes at a carnival freak show. Rachel is found sadistically slain, the team goes behind the scenes of the carnival freak show to find her killer.

The CSI crew is stumped when they discover a disembodied brain at a crime scene where all the other brains are accounted for.

When the CSI team investigates three seemingly unrelated murders, they discover someone is getting revenge for cold case murders that were never solved.

As CSI and the FBI work together to solve the murder of a gunrunner working for a private defense firm, they discover that hundreds of very dangerous black market weapons may be out on the street.

When a genealogist is found dead in Dr. Robbins' bed, the team works on the theory that his wife may have been cheating even though she maintains her innocence.

The skeletal remains of three people are found in the desert. Initially beetle evidence implies they had been dead at least a week but other factors contradict that. They bodies were identified as a lawyer, that Catherine had a connection with, and his two employees. Catherine had recommended the lawyer to a friend, who was trying to escape her dangerous husband. After analysis the beetles appear to be genetically altered. Catherine fears her friend could be dead until she makes contact with a location.

Catherine goes into hiding with D.B. after Mark Gabriel's hitmen try to kill her, but they soon come to the realization that Gabriel himself may not be calling the shots.

When a "hair stalker" escalates to murder, CSI turns to his "muse" to identify a suspect before he claims his next victim.

D.B. turns to a "blood whisperer" from his past to help solve a crime involving a gunshot victim who has lost his short-term memory.

Three dysfunctional siblings fight over ownership of their deceased mother's house, while the CSIs investigate the disappearance of the wife of one of the siblings.

The team works against the clock to find a kidnapped boy, which becomes even more difficult when a blackout shuts down the entire city.

The team discovers that a WLVU student notorious for his gossip video blog was killed because he was about to expose a major campus scandal.

While the team tries to figure out a team of wedding bandits' next target before they strike again, Morgan pretends to be David's girlfriend to impress his mother.

The task of figuring out who shot and killed a pediatrician in a casino becomes more difficult when the team discovers that the killer is one of three identical triplets.

A killer is about to go free because of a dirty cop, so the team tries to connect him to an earlier crime to keep him in jail.

A vehicle explodes during an off-road race, and the team discovers that it may have been connected to a plot to kill an oil executive.

While at a campaign dinner for the Sheriff, the team are called to a triple homicide with a familiar victim.