The Gravedigger returns and captures Booth. He wants the evidence that someone has stolen from the case, and he believes that Bones has it. Can the Squints find their friend before Booth becomes the Gravediggers latest casualty?

The trial of The Gravedigger hits close to home for members of the team, and everyone at the Jeffersonian must work overtime to uncover the forensic evidence to elicit a conviction.

The city anxiously anticipates the arrival of Heather Taffet, more notoriously known as "The Gravedigger," for her final appeal after being sentenced to death for a kidnap-murder and a series of similar coldblooded crimes. But when a bullet targeted at The Gravedigger is fired from a distance and hits her, the Jeffersonian team is tasked to piece together the sniper's precise location as well as identify the suspect and his motives. With the help of probing investigator Caroline Julian, Booth and Brennan put together a list of likely suspects, but the evidence and the remarkable skill needed to pull off the crime leads the team to believe that the crime was an inside, professional job, leaving Brennan's father Max and even Booth as plausible suspects. Meanwhile, Sweets attempts to put on a brave face after being caught in the firestorm just moments following a chilly encounter with The Gravedigger.