Clear as day. There is not one clue in this case. Not one. You can speculate on green vans, broken globes, answering machine recordings that got erased, killers that checked gas lines, brothers that reenacted civil war battles, psychics that were told where the bodies were buried in a dream, waitresses that served them that morning, killers that maybe got their haiur cut by one of them, grave-robbing ex-boyfriends charged with a crime, etc.. But there is literally not one piece of evidence to work, not one. Couple that with no motives, forget it. It will not be solved. There is no mystery DNA to send to CODIS, or a latent print that just needs a match. No witness that heard screams. Nothing.