When the deputy mayor is killed, suspicion quickly falls on a sleazy newspaper publisher. Meanwhile, the "blue flu" could cause problems between Danny and the crime lab.
An environmental terrorist group bombs the home of an electronics recycler, and his daughter is killed--but the daughter is part of the terrorist group. Meanwhile, Danny considers proposing to Lindsay again.
The lab makes a grisly discovery while investigating the death of a former Medical Examiner's wife, and Stella sets up a trap for the Greek coin thieves.
A murder victim turns out to be a violent stalker, and the killer may be one of his stalking victims who learned to cover her tracks by attending one of Bonasera's college seminars.
A man is killed when he falls out a window in media mogul Robert Dunbrook's building, but did Dunbrook throw him? During the investigation, Mac discovers that the case is connected to an earlier case involving a missing flash drive.
A murder leads CSI to a group of white supremacists, the discovery of precious items stolen from Holocaust survivors, and perhaps the uncovering of a former Nazi guard.
Stella discovers that her old friend, Professor Papakota, may be connected to the Greek antiquities smuggling ring and travels to Greece to investigate.
A group of violent kidnappers capture Robert Dunbrook's son just before he is scheduled to testify to a grand jury against his father, and the CSI team is rocked by a tragedy.
Following a spray of machine gunfire, the CSI team rises from the chaos. But when one member's life is significantly changed, it proves to be the emotional motivation they need to piece together their lives and ultimately find the shooter.
The case of a cyber killer, who appears to be targeting medical health-care workers, turns personal when the suspect invokes the name of Mac's father who had died nearly two decades earlier.
While investigating the DNA from a murder scene, Hawkes discovers that the DNA is connected to more than a dozen cases over a three-state area. But does the city really have a serial killer on their hands, or is there another explanation?
When a software company executive bleeds to death on a Manhattan street, the CSIs must delve into the wet and messy world of food "sploshing" parties - where groups of people experience food in an sensual way - to find his killer.
A big rig accident results in the discovery of an interstate trucking ring that specializes in human cargo and black market organ harvesting -- and sets off a race against time to save a hostage.
After a body falls from the 59th Street Bridge, the CSI team finds a compass near the body pointing east, and realizes it's the third victim of the Compass Killer. Meanwhile, detective Flack, still dealing with Angell's death, goes AWOL.
Mac and the team lose the Compass Killer at the World's Fair site, and they soon discover through the use of astronomy and sunrises that it's only a matter of time before he targets the next victim.
Mummified remains are found in a booby-trapped Manhattan penthouse that has been closed off for more than 80 years, and Mac and Stella race against time to find the people who discovered the body, who are still trapped in the building.