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The 34th Floor

Episode number: 1

Overview: The newest member of the CSI team, Jo Danville, a former FBI agent, is welcomed to her new job by stumbling upon the body of a young woman murdered somewhere in the building that houses the NYPD Crime Lab.

Unfriendly Chat

Episode number: 2

Overview: When a young woman appears to be strangled while participating in a live online chat that Adam witnesses, the CSIs must determine if it was real or a hoax, and locate where the possible victim is.

Damned if You Do

Episode number: 3

Overview: When a married couple is found beaten in their home, a mother identifies her son as the killer and the CSIs believe they have their suspect, but all is not what it seems when another witness comes forward.

Sangre Por Sangre

Episode number: 4

Overview: When the leader of a powerful New York gang, El Puño, is found murdered, the CSIs must find the killer before a street war with a rival gang breaks out. Mac asks the co-founder of El Puño, Luther Devarro, a man he put behind bars years before, for help.

Out of the Sky

Episode number: 5

Overview: A jewel heist at the penthouse of one of New York's most powerful attorneys takes a bizarre turn and the case leads the CSIs to a seemingly unrelated man in the morgue.

Do Not Pass Go

Episode number: 6

Overview: When a badly decomposed body found is an abandoned car on a rooftop, Mac and his team must go up against a killer who is using the parents of his victims to manipulate crime scenes.

Hide Sight

Episode number: 7

Overview: Mac is on the hunt for a sniper who is using nitroglycerin in his bullets to explode on impact, and the prime suspect was once a missing boy from one of Mac's old cases.

Scared Stiff

Episode number: 8

Overview: As the CSIs investigate a case involving a woman who appears to have been scared to death in a supposedly haunted section of Central Park, Mac stumbles on another dead body buried nearby in the same part of the park.

Justified

Episode number: 9

Overview: When a woman's body washes up at the South Street Seaport, the CSIs unravel a dark secret from Deputy Chief Carver's past that threatens to shatter his stellar reputation and close-knit family.

Shop Till You Drop

Episode number: 10

Overview: Mac and the team search for the killer of a department store manager who was found dead in a holiday display window.

To What End?

Episode number: 11

Overview: When a man in full clown costume shoots a bakery owner, the CSIs investigate and discover a decision from Flack's past that may put him in jeopardy.

Holding Cell

Episode number: 12

Overview: When a Spanish club promoter is found dead, Mac must battle with the head of Barcelona's crime lab to solve the case.

Party Down

Episode number: 13

Overview: When a tractor-trailer carrying exclusive party guests mysteriously ends up at the bottom of the Hudson River, the CSIs must solve the mystery from the soggy remains.

Smooth Criminal

Episode number: 14

Overview: When the CSIs track down a suave and charming hitman, their investigation uncovers a conspiracy with far-reaching implications.

Vigilante

Episode number: 15

Overview: When a serial rapist is found murdered, restrained in the same manner as his victims, the CSIs weigh a feeling of justice against their sense of duty to pursue the killer.

The Untouchable

Episode number: 16

Overview: When a conspiracy-obsessed woman is found dead, the CSIs investigate and discover that some of her theories may have had some truth to them.

Do or Die

Episode number: 17

Overview: When a popular student and star pupil at Manhattan's most elite private school is murdered, the CSIs find themselves immersed in the highly competitive world of over-privileged youth.

Identity Crisis

Episode number: 18

Overview: Jo balances personal and professional challenges when her adopted daughter, Ellie, is the key witness in a murder investigation.

Food For Thought

Episode number: 19

Overview: While the team investigates the explosion of a gourmet food truck, Sheldon's new relationship could get him in big trouble at the lab.

Nothing For Something

Episode number: 20

Overview: The CSIs investigate a woman's death as the work of a serial killer, and Mac reconnects with his first partner after an ex-con they put away begins stalking him.

Life Sentence

Episode number: 21

Overview: After a hail of gunfire tears through the crime lab, Mac and his ex-partner become part of a vendetta 17 years in the making.

Exit Strategy

Episode number: 22

Overview: Following a near-death experience, Mac becomes determined to close his last remaining unsolved case.