After digging up the skeletal remains of a young girl, it becomes clear to Booth and Brennan that they’re not dealing with a normal case. It’s confirmed at the lab, when they discover that the cause of death points to a convicted serial killer on death row who they’ve captured in a previous case. A clue is found on the body that leads to another victim – this one only a week old. Brennan and the team must decipher cryptic clues to find the serial killer’s accomplice. Things get worse when the team finds out the next victim is still alive. They have to test their limits, racing against the clock, before the young girl becomes the next victim.