One of two couples who meet in a bar is murdered and, when the second couple meets the same fate in a similar fashion, the team suspects a pair of serial killers is on the loose. Catherine gets some troubling news about her father's murder trial.

When the lead suspects in Grissom's serial killer case are murdered, he suspects an inside job. Catherine and Sara investigate when a college football fan's body is found in a bathtub.

Grissom and Warrick get the case of an elderly woman found mummified in her closet. Sara and Nick arrive to investigate a 'break and enter' to find a raped teen. Catherine looks into a found gun, now linked to a week-old murder.

During the latest heat wave, Grissom and Catherine investigate a baby locked in a car. Warrick investigates a man dead of an apparent heat stroke in his house. Nick and Sara investigate when a woman's body is found floating in a lake.

The team investigates when a man's body is found on the side of the road... dressed in a racoon suit. A gunshot victim is found in a freezer.

When a severed head is shipped to Dr. Robbins from Jackpot, Nevada, Grissom goes to Jackpot to find the rest of the body but gets very little cooperation from the locals. Catherine gets an unexpected gift from her father.

Warrick's appearance at the preliminary hearing on a rape and murder case goes terribly wrong when the only piece of evidence is thrown out on a technicality. Grissom and the team have 24 hours to make the case with new evidence or the killer will go free.

A suspect's infatuation with Catherine results in her taking over the high-profile case of a missing woman who aspired to be a showgirl.

The sheriff is under political pressure to find the killer of an air marshall with a car bomb, Warrick and Sara investigate the murder of the wife of a headline singer on The Strip.

Grissom, Sara, and Warrick investigate the murder of a teenager found on a construction site. Nick and Catherine try to discover how a woman on her lawn was killed by a gunshot when no-one nearby had a gun.

The lone holdout member of a jury is found dead in the jury room. Nick reopens a four-year-old case when the sister of the victim comes forward with new evidence.

When a woman resembling Sara is found murdered in her home, Grissom takes a personal interest in the case, forcing him to examine the decisions he has made in his life.

Grissom, Sara, and Nick respond to an electrocution at a casino. Catherine and Warrick investigate a vampire murder.

A robbery at a grocery store results in a shootout leaving five dead.

The entire team investigates the execution murders of a porn star and her husband. Things get personal for Catherine when Grissom talks to her about her evaluation.

Catherine and Sara deal with the death of someone who appears at first to be transvestite. Grissom, Nick and Warrick investigate the death of a man in a homeless area.

A mutilated female body is discovered tied to the undercarriage of a bus carrying prisoners from a women's correctional facility. Warrick investigates the murder of a gambler in his brother's kitchen.

The investigation of a violent murder in a casino parking garage leads to a missing woman, a long-dead body and a missing child.

Warrick, Catherine and Nick try to determine the cause of a house fire that kills a teenage kid. Grissom and Sara investigate when a competitor in a word game tournament is found dead with letter tiles in his stomach.

Grissom, Catherine and Nick investigate the death of a runner during a competition. Sara and Warrick look into the suspected murder-suicide of a couple in a hotel room.

The team investigates a roller coaster accident that leaves six people dead. Warrick and Catherine attempt to track down the killer of a 13-year-old girl.

Grissom and Warrick investigate the murder of two men who had scammed Sam Braun's casinos.

A casino employee is beaten and raped on her way home from work, but she survives and identifies her attacker. When a DNA test sets him free, Grissom wrestles with his belief that evidence can never lie.