- The hanging death of a possible hermaphroditic male is connected to a tainted water supply, while the day crew investigates 40-year-old skeletal remains found at the site of a recently-imploded casino.
- Brown and Stokes investigate the death of a young man found hanging from a tree. They believe this to be a hate crime as the man had breasts and is believed to be a pre-operative transsexual. As the investigation continues however, they learn he worked at a local water treatment plant and may have been up to something else entirely. Sidle and Lake investigate when a skeleton is found at the construction site for a new hotel. The site was once the Rampart Hotel owned by Catherine Willows' father. Her mother provides valuable information on the case. Grissom and Sidle decide on their future.—garykmcd
- A young man is found in a tree, having died by apparently hanging and/or poisoning. His hermaphrodite characteristics suggest an amateur sex change and a hate crime. But the water company's basin where he was found is poison-contaminated, and Paul Cydon, with whom the boy had frequent secret dealings, notably an experiment involving carp, is murdered next. Catherine has to disqualify herself as the corpse found is a casino demolition-construction site may be her father's.—KGF Vissers
- When a teenager is found hanging to a tree, Capt. Brass, Grissom, Nick and Warrick investigate the murder. They believe that it might be a hate crime, since the victim has breasts. They find also a cell phone with messages between the victim and PCYDEN and they identify the victim is the eighteen-year-old Brian Towne. Warrick and Brass go to his mother's home and they learn that Brain worked in the water treatment plant and his contact is his friend Paul Cyden, who was like a father to him. When Warrick asks if the money he found in Brian's room is for a sex change operation, his mother says that her son was not a freak and sends them away. Soon they learn that Paul is researching the quality of the water provided to the residents. When Paul is found dead by Catherine, the CSI team discovers what is happening with the local water. Meanwhile, Sara, Ronnie and Greg investigate a body discovered under the Rampart, and Sara suspects that it might be an Indian cemetery.—Claudio Carvalho, Rio de Janeiro, Brazil
- When a young man is found hanging from a tree strangled to death, the CSIs move in to find the killer. It appears that the man, Brian, was taking hormone injections in preparation for a sex reassignment surgery. But as usual, there's more to the story. Brian lived near a local water treatment reservoir where children often swam and fished. The recycled reservoir water was considered "grey," meaning purified, though it was not meant to be drunk.
A former hydrologist, Paul Cyden, had enlisted Brian's help to find out the truth about the reservoir. The water had been contaminated with pharmaceuticals, which had leaked into ground water in the town as well. After Paul is murdered in his home, Brian's mother is identified as Paul's shooter. She had misunderstood Paul and Brian's connection, and believed he had murdered her son. But Brian had killed himself, unable to deal with the humiliation of his misshapen body. To make matters worse, Brian's mother, ill with cancer, ultimately discovers that her cancer is also due to the water's contamination.
Sara continues to work alongside Ronnie Lake on swing shift, and they handle the case of a body found at a construction site. With Greg's help, they deduce that the man had been a reporter covering the opening of a casino (built by Catherine's father, Sam). He died with a film canister in his hands. When Greg develops the film, he discovers evidence that the gaming commissioner at the time was on the take. Sam's bodyguard, Benny Dunbar, killed the reporter to keep the news quiet. Lily, Catherine's mother, helps out on the case, and Greg takes her out to get more information from her for the book he's writing on Vegas.
Meanwhile, as Grissom continues his study of bees, he makes a proposal of marriage to Sara. She accepts.
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