Mysteries make for great TV, but that's because they tend to get solved by determined, insightful detectives. Unfortunately, in real life, some mysteries never get cracked, even by the most determined, insightful, and experienced detectives.
Will anyone ever solve this mystery? It's hard to say. There might not even be a neat and tidy solution — it could all be coincidence. But the FBI is investigating a strange series of deaths all the same.