One of the models at a fashion show is killed by electrocution while walking down the runway and Horatio believes the killer was sending a message to them. When Ryan and Calleigh check out the wires below the runway, they uncover that each of the models had their own personalized lighting, and that a small fire made the evidence burn and disappear. Meanwhile, evidence that is found at the scene leads Horatio to a prisoner who, appearently, was the dead model's husband. Horatio also visits his son in prison, who is having a hard time in there.