The CSIs find the body of Kathleen Newberry, but the money she got is missing. Horatio pays another visit to Julia Winston, but Julia has Horatio arrested for the murder of Antonio Riaz and extradited to Brazil. While investigating the case, Calleigh finds out her crime scene photos have been stolen and posted on the internet. The website eventually leads to ex-lab technician Dan Cooper, who has a personal grudge against Calleigh. Calleigh is kidnapped by somebody who knows her through the internet.

The team springs into action to stop a vigilante who is hunting down and killing Internet predators, who were exposed on a show which lures predators by pretending to be teenage girls. Horatio ends the episode as he prepares to torture the predator, claiming that he was resisting arrest.