Bryan Cuprill

After the disembowelled body of an FBI agent is found burnt and hanging from a roof, Brennan and Booth find themselves deep in the middle of a dangerous conspiracy.

While tending a bar, Xander becomes alarmed when an intoxicated Buffy and her new drinking buddies are reduced to a primordial state.

When Buffy and Riley rouse a supernatural force, they are held hostage by ghost-children who have returned to exact revenge for past abuses.

Finlay and DB investigate a bizarre murder scene that has all the hallmarks of a serial killer they apprehended five years ago. To track down the killer, Finlay teams up with an old flame who is in town looking for his missing partner.

In this conclusion of the two-part episode, the Philadelphia PD and the FBI continue their joint operation to catch the serial killer before he strikes again.

Without meaning to, Billie causes the breakup of Abby and her husband after she asks them to be the godparents of her child. Elsewhere, Billie has to prevent her sister from making any more mistakes during a night out with Davis.