Brennan and Booth are on a lecture tour in London, where their trip is extended after they're drawn into the investigation of the murder of a wealthy American's daughter.Meanwhile, back at the Jeffersonian, Angela is surprised by the return of her estranged husband, who must agree to a divorce before she can marry Jack. Having solved the murder of a wealthy American's daughter, Brennan and Booth are persuaded to remain in London when one of their English colleagues is killed.
Season 4, Episode 4September 17, 2008The discovery---not far from the Jeffersonian---of the mutilated body of a veterinarian leads to an investigation that uncovers the deceased's gambling addiction and possible ties to an illegal dogfighting enterprise. Season 4, Episode 5September 24, 2008When the murder of a reclusive science-fiction writer with obsessive-compulsive disorder has the Jeffersonian team stumped, Hodgins turns to Zack (Eric Millegan) for help in piecing together the evidence to track down the killer.
Season 4, Episode 6October 1, 2008When the mangled corpse of an office manager is found in an elevator shaft, Brennan and Booth probe the complexities of the company's politics to find out if any of the numerous grudges borne by her former coworkers shed light on her tragic death.
Meanwhile, Hodgins and Angela have a long-delayed discussion about their breakup.
Season 4, Episode 7October 8, 2008Brennan and Booth alight in a small religious enclave on the Chesapeake Bay when the remains of the community's pastor are discovered, but they have their work cut out for them in determining the true identity of the victim and a possible motive for murder.
Season 4, Episode 8November 5, 2008A sculptor's corpse is found in a crushed car at a junkyard, and the team must decide if it's the result of the dead man's artistic suicide or murder.
The case is complicated by the fact that his assistant---Angela's ex-girlfriend---is a suspect.
Season 4, Episode 9November 12, 2008The discovery of a body at a state-police training site leads to the investigation of a confidence game, played on a struggling inventor, that resulted in a pair of murders.
Meanwhile, Booth's brother (Brendan Fehr) takes a job at the Pentagon and develops a crush on Brennan, and Hodgins and a returning Clark Edison test the viability of the inventor's designs. Meanwhile, Hodgins tries to come to terms with Angela's new relationship.
Season 4, Episode 10November 19, 2008On a trip to China to inspect prehistoric remains, Brennan and Booth try to solve the airborne murder of a travel writer, but the pair must find the killer before the plane lands in Shanghai and takes the case out of U. Season 4, Episode 11November 26, 2008As Brennan struggles to accept the hiring of her estranged father (Ryan O' Neal) as a teacher at the Jeffersonian, the team searches for clues in the murder of a former Marine who was working as a nanny for a wealthy family.