A dead teenager, Eric, lies naked in the desert. In autopsy, Grissom and Warrick learn that Erics body is abnormally dry. Warrick discovers that the maggots found in his body contain jimsonweed, suggesting that he ingested the drug before he died. Warrick also finds traces of aluminum in Erics nose.
Brass questions Bobby, Erics friend. Bobby says that he and Eric attended a rave and that they drank a tea that they bought that night. He does not remember what happened after that, but knows that he has not seen Eric since the rave. The coroner finds jimsonweed seeds in Erics stomach, but the seeds were not toxic enough to kill Eric. As he questions Bobby, Bobby continually scratches his arm; he says he thinks a spider has bit him and shows the bite to Grissom. He also tells Grissom that he works in a fireworks shop.
Grissom and Warrick realize that after the boys drank the jimson tea, Eric developed photophobia. Scared by the lights of the rave, he ran into the desert and took off his clothing as his body temperature rose. Meanwhile, Bobby developed auditory hallucinations, and he attacked Eric to keep him quiet. The aluminum in Erics airway came from Bobbys hands as he suffocated him, and the bite mark on Bobbys arm matches a mold of Erics teeth.
Sara arrives at a dumpster where a womans body, wrapped in plastic, has been dumped. She discovers that the womans body has been embalmed, and uses the womans fingerprints to learn that the woman was buried the week before. Sara talks to the funeral director who suggests that the grave was robbed for gold or jewelry. They exhume the grave but find no casket, and the director suggests that the casket was stolen too as it would be just as valuable. Sara arranges a viewing of the caskets and is surprised to find hairs from multiple donors inside the caskets. She discovers that the fingerprints on the plastic belong to the funeral director, and he confesses that he was recycling coffins in order to make more money.
Catherine and Nick arrive at a school and find the dean in an office, dead due to blunt force trauma to the head. The founder of the school, Kit Armstrong, says she hit the dean on the head with an object in self-defense after he tried to force himself on her. Catherine and Nick determine that the dean was hit three times while he was lying on the floor. They also discover a void in the spatter pattern, indicating the presence of a third person in the room when Dean Woods was killed.
Kit admits that she had asked Julia Easton, a teacher, to come to the office to witness the harassment. Nick tells her that reenactments of the crime show that the dean was on the floor when he was killed and that Kit would have needed help to hold him down while she hit him. Catherine and Nick process the deans shirt and find a void in the blood spatter. They trace it and find a hand print, one with a disproportionely long pinky finger. They question Julia and learn that she has a sprained pinky finger. Nick offers her a finger splint as Catherine demonstrates how a hand with a splint on the pinky finger creates the exact void found on the deans shirt. Catherine speculates that Julia held down Dean Woods while Kit killed him. Kit confesses that the dean was blackmailing her after learning about her lesbian relationship with Julia.