Horatio and the team, reunited, encounter the Mala Noche gang while investigating a shooting that killed an officer and the rape of a maid.

A case involving the death by shark of a young woman, takes many paths.

The search is on for a young woman who disappeared from a club, and an old case of Horatio's resurfaces.

Tobey Hollins is caught by the Miami Police Departement and is sent to prison for murder. Horatio has some doubts about Tobey's guilt, since some evidences clearly identify some one else as the murderer. Horatio and his team now try everything to disprove Tobey's guilt.

Henry Darius, a man who killed several women in New York, claims that he also killed a woman in Miami and offers to show them where he buried her. The plane transporting him suddenly has to make an emergency landing and Dairus escapes. He kills some people to get their car. Horatio learns that the plane was sabotaged and he thinks Darius had a hand in it. Horatio sends for New York Detective Mac Taylor who was the one who caught Darius. Horatio decides to look at the woman's disappearance again and discovers that the husband didn't tell him some things that could have helped him find his wife. Darius continues to go on a killing spree and Horatio learns that Darius is not the killer, so he has to find out how Darius knew about the woman.

Ryan Wolfe, with a nail knocked next to his eye, is being carried to hospital by Delko. There, Horatio remembers how the day started, with the discovery of a murdered woman who was attacked by someone with a nails gun.

During an early morning trip to the bank, Delko ends up witnessing a robbery and fatally shooting one of the suspects. As the investigation progresses, Wolfe realizes that the robbers are trying to replicate a violent video game.

When a drug dealer is gunned down in his home, Horatio and the team must determine who, out of three suspects, committed the crime. Meanwhile, Delko faces a serious threat to his career, and Calleigh makes a decision about hers.

A participant in a seminar on how to pick up women is found murdered after he's "closed the deal." Elsewhere, Marisol gets into trouble that affects the lab.

Horatio and his team investigate a double murder at a concert, but unraveling the mystery becomes difficult when leads take them in two directions: the Mala Noche gang, and a pharmaceutical company.

A trip to the beach for Eric Delko turns sour when a body is uncovered beneath the sand. The man was killed elsewhere and dumped here. Elsewhere, Horatio is certain that his old enemy from New York is back when two murders occur in Miami. He immediately contacts Jennifer Wilson whose parents were killed by the same murderer, Walter Resden, many years back when she was still a little girl.

The murder of a paroled pedophile leads the team to many suspects, one of them at the lab.

As a murder investigation becomes more complicated, Caine must ask Natalia to reveal something from her past in order to solve it.

A robbery at a spa injures Marisol, and a hunt starts for the three thieves before more are hurt.

The team ends up trying to help recently released suspects who may be in danger because of money they've stolen.

A misdialed cell phone number sends the team on a desperate search for a kidnapper.

A spoiled heiress is found dead in her bathtub during her own party, and the investigation puts Horatio on the trail of an abducted young girl. Horatio tells Delko of his marriage plans.

The hunt for Riaz continues against the stress of the FBI taking over the lab based on an anonymous tip and one of their own being killed.

Delko and Caine follow Riaz down to Brazil, where an unexpected family connection appears. Meanwhile, Calleigh is in charge while Caine is away, and Natalia is having a rough day.

A biker who falls off a balcony was an undercover A.T.F. agent. The gang he infiltrated may be running "corner-shot" guns designed for urban warfare, and another agent who also infiltrated the group may hold the key to the case.

The murder of a young socialite could be connected to a death pool, an offshore gambling boat, and a counterfeiting ring.

Investigating a male corpse found in the marina involves male models and their modeling agency, while Natalia's abusive ex-husband begins stalking her.

Wolfe believes that he may have triggered a Santeria curse when he disturbs a miniature coffin at a murder scene.

The investigation into a beheading during a stunt at an automobile "sideshow" could ultimately expose a larger cover-up involving stolen cars and jet fuel.

After the murder of a bachelorette contestant in an auction, CSI discovers that the victim was working undercover for the government. And the event organizer may have connections to a terrorist cell.

The death of a Marine recruiter ultimately leads Horatio to open an investigation into the death of a soldier in Iraq. The soldier's brother claims responsibility, but Horatio suspects a cover-up.

The defense attorney in Horatio's terror cell trial is murdered by a stray bullet, but the investigation reveals that his client was the real target. Meanwhile, Wolfe compromises the only evidence in a gang-related murder.

The death of an illegal emigrant by land mine ends up turning into three investigations that also include an assassin and death at a bar. Unfortunately it also puts several officers at risk, and Delko into an untenable position.

The robbery of a police truck containing confiscated weapons is connected to a plot to spring Clavo Cruz from prison, and one of the guns stolen in the robbery is used in the shooting of a young boy.

A grizzly bear attack in the everglades puts suspicion on the hunting party, but things get more complicated once their hotel room is found.

An actor is found dead in the trunk of a stunt car, but the investigation reveals that he actually died in his room at a high-profile celebrity rehab facility.

CSI goes after a serial killer whose signature is related his extra "Y" chromosome, once believed to be the "killer gene."

A young woman dies from carbon monoxide poisoning but the man with her survives, in what appears to be a suicide pact related to their credit card debt. Meanwhile, Delko starts seeing his dead colleague, Tim Speedle.

The body of the witness Julia Winston paid off in Horatio's son's trial is found in a swamp, but Horatio's investigation is interrupted by his extradition to Brazil to face murder charges. Meanwhile, Calleigh is kidnapped.

Calleigh's kidnappers use her to try and cover up a shooting death that they committed. However, she discovers that the gunshot is not what killed the victim. Meanwhile, CSI uncovers more clues in the death of the trial witness.