Mac and Danny look into the mysterious death of a man torn apart by tigers at the Bronx Zoo, which leads them to both the dead man's meat packing plant as well as his mafia relatives. Hawkes and Stella are left with the case of a beautiful young debutante found dead on the carousel only hours before her coming out.

The episode was rated 7.53 from 99 votes.

After the body of a dead woman is found in a water tower the team suddenly realizes that the building may hold a bigger mystery than they expected.

The episode was rated 7.53 from 70 votes.

Mac, Danny and Lindsay investigate the death of owner of a doll hospital. Stella and Hawkes look into the death of a woman with terminal cancer.

The episode was rated 7.54 from 83 votes.

Mac and Stella investigate a murder of a host of a high stakes poker game after a player was caught cheating and kicked out of the game. While Danny and Hawkes follow the clues that'll lead them to solve the death of a weather girl.

The episode was rated 7.54 from 90 votes.

Mac Taylor and his team investigate a double murder at an oil company. Dr. Hawkes and Det. Flack team up to investigate a case about a teenager who loved to spend his time behind the computer a little too much.

The episode was rated 7.55 from 96 votes.

Stella is invited to an art gallery where she sees several paintings done by an artist named James Golden. Stella thought she was going to Frankie's place and not to an art gallery. Outside the exhibit two people are kissing and one of them is shot in the back with an arrow.

The episode was rated 7.56 from 71 votes.

The life of a transplant patient hangs in the balance as the team tries to find the hijacked plane carrying the liver.

The episode was rated 7.59 from 82 votes.

When a man is found murdered in an elevator, Mac, Flack, Danny and Lindsay investigate a world where very young girls enjoy sexual encounters with much older men. They're left trying to determine whether their best lead is a suspect, a witness ... or the intended victim. Stella and Hawkes investigate the death of a young man found in Central Park who died from an extreme allergic reaction and learn that he had been pretending to be someone that he wasn't.

The episode was rated 7.60 from 86 votes.

Two women both claim to be the wife of a murder victim surprise Mac and Stella at the circumstances of their relationships. Both women have been in a trinogamous marriage with the victim. Meanwhile, Danny and Lindsay investigate the murder of a young woman who is found off a dock tangled up in kelp while she is dressed as a mermaid.

The episode was rated 7.63 from 82 votes.

Mac and Lindsay question Kid Rock because he was the last person to see his limo driver alive when the driver is found dead in the alley just before Kid Rock’s encore performance concert.

The episode was rated 7.65 from 78 votes.

Mac receives a phone call confessing to an old murder before the caller commits suicide. The call leads the team to a football stadium to uncover a body and they learn the suicide victim belongs to the Tanglewood gang. They also find a cigarette that puts Danny's job on the line after his DNA is found on it. Stella and Danny investigate the death of a businessman who used the services of an expensive call girl service.

The episode was rated 7.71 from 83 votes.

Stella and Danny investigate when a jewellery designer is found dead, wearing the eight million dollar bra he created, and investigate the model he had shot and her bodyguard. Aiden begins to take the rape case she has been working on a little too personally, and is determined to stop the man before he can rape again. Hawkes gets to go into the field for the first time as he assists Mac in investigating the death of a man who liked to climb skyscrapers.

The episode was rated 7.71 from 108 votes.

(Crossover episode with CSI: Miami, Season 4 Episode 7.) Horatio Caine follows Henry Darius to New York so that he can keep his promise to a young boy in Miami, but by the time he and Mac are able to locate Darius he has disappeared again, leaving behind six more bodies. A link to the younger sister of one of the victims who was also Darius' hostage turns out to be a dead end, but Mac and Horatio soon find the connection between Darius and his hostage, leading them to a psychiatrist who had treated both.

The episode was rated 7.73 from 92 votes.

Mack and Danny find marine corporal dead but if things don't seem right about his death. They find a drop of blood on his sleeve new signs of a struggle and several medals on his uniform. They both wonder why the Marine didn't fight for his life. Stella, Lindsay, and Dr. Hawkes are all busy investigating a dead body in front of a car they believe the body to be that of Charles Wright. There is one slight problem Sid confirms that the body found in the car is not Charles Wright. The body however in the car is a female. After Sheldon carefully begins facial reconstruction of the skull he would use a tool that will allow him to import this call into the computer so he can match a face to that skull. Sheldon comes up with a surprising result. The skull and the photo match that of Aiden Burn.

The episode was rated 7.94 from 85 votes.

In the season finale Mac Taylor has a lot on his plate. He must come to grips with having let a marine die in Beirut in 1983. Also the team must stay one step ahead of a bomber.

The episode was rated 7.99 from 81 votes.