Stalkers turn an innocent teenage swimming star into a sex symbol, plastering photos of her over all the internet, causing complications for the CSI team when the swimmer's boyfriend is murdered during her swim meet. When following her it is discovered Horatio may be in danger after his testimony in a grand jury.

A young woman dies from carbon monoxide poisoning but the man with her survives, in what appears to be a suicide pact related to their credit card debt. Meanwhile, Delko starts seeing his dead colleague Tim Speedle due to hallucinations resulting from the brain injury he sustained in the previous season.