|Original Airdate||October 14, 2004|
|Previous Episode: Down the Drain|
|Next Episode: Crow's Feet|
"Harvest" is the third episode of the fifth season of CSI: Crime Scene Investigation.
An Amber Alert is sent out when a young girl, Alycia, is kidnapped. She later turns up, wrapped in a blanket stained with her blood, even though she has no injuries. Investigations reveal that she has been giving her elder brother bone marrow transplant and was going to donate one of her kidneys to him. Meanwhile, Catherine has to deal with Lindsey who was caught hitchhiking.
Alycia, a 13 year old girl, is with her sister at a convenience store, when somebody pulls her into a white vans and pulls away. The CSI investigate her room and find a science fair project on the human body. They search her computer and find she was looking up detailed websites about organ transplants. So they question her brother, who runs out when he gets a nosebleed. Next, her sister, who has no idea why they are accusing her of something. Next, they question her crush, and he tells them, that someone had been following the two of them. He gives them the picture and they go to his address. They search his house and find a pair of pink underwear on his bed, prefferably a girl's pair of underwear. They search his phone and find pictures of Alycia. They arrest him, and take him to jail. They soon get a call that her body was found in the trunk of a car in a corn field. They take her body to HQ, and discover marks on her back. They search her house and find a camera on a stand. They take the stand back to their cars and Grissom questions the parents. That's when Grissom thinks back to April's brother, when he got a sudden nosebleed. Nosebleeds are common in luekemia. They look through the medicine cabinets and find leukimia medication, and another medication that cures something unknown. They ask the brother, and discover Alycia had donated bone marrow to him twice, both times from her hips. Back at HQ, they examine an xray of her hips, and find tiny pinwholes where the marrow was taken. It's a miracle she stayed alive for so long, considering it's hard to take marrow from someone once, let along twice. They find she also has to take a daily supplement for calcium. They discover the marks on Alycial's back matched the poles on the camera stand, the one they got from the trunk of Alycia's dad's car. They question her parents, and they admit they were the ones who killed her. Her mother gave her the wrong medicine, which slowly killed her and caused her blood to get on the blanket they wrapped her in. They tossed her in the dad's trunk until they found a place to put her. So they drive an old car down into the cornfield and toss her body in the trunk of a deserted car. Then, Grissom goes to the church where her brother, Daniel, is. He says he killed her so she wouldn't have to suffer any longer. Grissom says that is bogus, in which Daniel responds by saying Grissom doesn't believe in God.
- Greg's replacement, Mia Dickerson is introduced for the first time.
- It's revealed that Mia suffers from OCD.