No Bones again this week, folks. So, once again I'd like to dip into the speculation bowl for a bit of discussion.

In last week's episode Jack and Bones were buried alive by the Grave Digger, a serial killer who would kidnap his victims and give them enough air to survive until a ransom was collected. This time around, his victims were saved by their own intelligence and ingenuity. At the end of the episode, rather than revealing who the Grave Digger was, as they usually do with each week's murderer, it was left up in the air for, hopefully, a future episode.

So, my friends, the question I pose to you is: Who is the Grave Digger? I have three theories myself. Read on and see if I match what you think.