Working alone, Mulder travels to Los Angeles when a man is found dead, exsanguinated in his spa. This is the sixth such case Mulder has identified and the evidence at the crime scene is identical to that found at the others. The perpetrators are a trio of would be vampires but even the normally open-minded Mulder is skeptical about their real selves. That is until one of the trio is arrested and bursts into flames in his jail cell when sunlight touches him. Mulder meets someone who knows what they are and what they do.