A man desperate for justice creates a hostage situation at the Miami/Dade Police Department, and Horatio looks into his claims. One of the hostages is Jesse Cardoza, a former CSI who is returning to his old job.
A "cougar" is romantically connected to three victims who were electrocuted during a beach volleyball tournament, and the internal investigation into Calleigh and Delko comes to a conclusion.
An investment broker who stole millions is found dead in his plane, and the investigation reveals no shortage of people who wanted to kill him--but none of the money he stole.
While investigating an e. coli-related death, the team finds itself stonewalled by a powerful corporate interest, and the case takes a serious emotional toll on Delko.
Horatio Caine calls Las Vegas CSI Dr. Ray Langston to come to Miami when a severed leg found in the Everglades is discovered to belong to a girl who went missing in Las Vegas a week earlier.
The team suspects that a company is killing its employees in order to collect on the insurance policies it put out on them, and a mysterious woman from Jesse's past returns.
The team finds the body of a dead census report taker in the trunk of a car, and the investigation takes a dangerous turn when it leads Wolfe and Boa Vista to a booby-trapped meth lab in an abandoned foreclosed home.
A man is chopped in half, and the lab tries to tie the case to a Japanese mobster, who seeks custody of his biological son, who was adopted by the victim. Meanwhile, Natalia's hearing loss nearly makes her a victim during the investigation.
A pornographer who was acquitted in Los Angeles for the murder of his wife is suspected of killing anther woman in Miami. Horatio and Delko travel to L.A. to further the investigation--and clear Jesse's Cardoza's name.
An office receptionist is killed with an ax at her workplace, and the team discovers that several employees held grudges against her, as well as a surprising tragic secret from her past.
An Iranian man is burned to death. The prime suspects include Horatio's son Kyle's army buddy Brian, who is on military furlough, as well as Brian's girlfriend, who was the victim's daughter.
While CSI tries to figure out who and what caused a fatal house fire, Calleigh communicates with the victim and searches for clues by means of an out-of-body experience while in a coma.
While investigating a murder that takes place during a diamond heist, the team discovers that the culprits weren't after the diamonds. Meanwhile, a package of diamonds is stolen from the evidence box at the crime lab.
The state's attorney Delko has been working with is killed by a car bomb. The car was stolen from Evidence just like the diamonds from the earlier case, and the evidence soon leads back to Wolfe.
Horatio suspects that a disgraced graduate psychology student is killing the people who caused her to fail, and is leaving cryptic messages for the crime lab. However, could it actually be part of an even more sinister plan?
