An Irish gang sets an elaborate plot to reclaim a drug shipment being held at CSI after a bust, but Mac, Stella and Hawkes are forced to take them on. Meanwhile, Danny is being held as a hostage at another location by the same gang.

The investigation to Mac's botched bust continues. Meanwhile, a guy who crashed his bride-to-be's bachelor party, is found dead in the restroom, and the eye witness testimonies point to tennis star John McEnroe.

Detective Scotty Valens from Philadelphia's Cold Case unit comes to NY to investigate a murder that connects to Stella's past. Also Mac's recent solo bust is scrutinized because a handcuffed criminal fell of a rooftop.

A body of a woman, Emma, in a black party dress is found in a dumpster. Her head is wrapped in packing tape. When the ME examines the body, he finds that her eye lids have been removed. This leads Mac to a recently released serial killer with the same MO. The second case possibly involves the Russian mafia. Lindsay and Danny team up to unravel the truth.

The team finds itself investigating the murders of three different people, only to discover that two of the murder victims are linked and may have been killed by the same person. One of these cases becomes personal for Mac.

At a French Revolution themed fund raiser at the UN, specifically at the French consulate, Mac, Stella and Hawkes find themselves hurdling diplomatic road blocks investigating two murders leading to an unexpected suspect. Meanwhile, Danny and Lindsay reunite on a "blinged" out cockroach that lead to murder of a prominent chef.

A famous magician plans three death-defying stunts on three consecutive nights. But on the first two nights, two of his assistants die in ways that eerily resemble his stunts. Can CSI solve the mystery before there's a third victim?

A conman is shot to death, and detectives discover a large "Noah's Ark" behind his house. Meanwhile, an anti-cigarette protester is killed when somebody sets his cigarette outfit on fire.

A woman is found dead in a bathtub and a bullet is found, but she has no entry or exit wounds. And Stella possibly gets infected with HIV-positive blood while investigating a second murder scene.

A personal shoplifter supposedly turns murderer when a loss-prevention officer gets to close to her operation. Mac and Hawkes take a closer look at the death of a college student who was recently inducted into a secret fraternity.

The death of a drag queen appears to be related to an old rape case involving a congressman, and two of the suspects in a second murder case are discovered to have used a professional alibi-providing company to conceal their affair.

A competitor is murdered during an "idiot run" shopping cart race in Central Park, and CSI suspects that a man found dead in a brownstone may have been murdered by a missing woman that he may have been holding hostage.

A teenage girl is killed, and the only potential witness is her deaf mother. The case also brings back some haunting memories for Lindsey. Meanwhile, CSI also investigates the murder of a star figure skater.

Hawkes is identified as the killer in a robbery and shooting, and CSI has to prove that he was framed. It turns out that Shane, the t-shirt killer, choreographed the entire incident.

CSI investigates the deaths of a homing pigeon racer and a father who was murdered at his daughter Sweet Sixteen party.

The murder of a young woman in a hospital goes undetected by the hospital staff. The victim was the driver in a drunk driving accident which killed her best friend, and she had just come out of a coma.

The investigation of the death of a professional paintball player is complicated by the discovery of drugs supposedly confiscated in a drug bust conducted by detective Flack years earlier.

During a Blue Train rave, a young girl dies among party goers when she starts bleeding from her eyes, nose, and mouth. The CSI's believe her to be a victim of a biological attack. The investigation is further complicated when it is revealed that Hawkes once knew the girl. Further up town, a rich playboy is found drowned in his indoor lap pool with his former maid as a suspect.

A hotel concierge falls to her death in the hotel atrium, and a woman says she shot the man who beat her husband to death with a hammer in self-defense.

An 18-year-old girl who belongs to an elite group of alternative-erotic models is murdered after a performance, and a playground basketball star is found dead on a Rucker Park court.

A series of cryptic messages embedded within t-shirt designs may help Mac figure out whom a serial killer's next targets may be. And one of the targets may be a CSI.

CSI investigates the deaths of a model stabbed by an ice dagger, and a marathon runner with frostbite marks on his face on one of the hottest days of the year.

Three women identically dressed as the Audrey Hepburn character "Holly Golightly" rob a jewelry store; a mummified woman is found in a building slated for demolition.

A man with an engagement ring turns up dead on the Brooklyn Bridge--but more than one woman could be the prospective fiancée. And a socialite dies in a penthouse with serious bruises and another man's blood on her body, and LSD in her system.