 In the episode "The Boy with the Answer", Booth is confronted with the possibility that Brennan, claiming she is "tired of dealing with murders and victims and sadness and pain", might leave the Jeffersonian permanently.In the final scene of this episode, Booth watches as Brennan turns to face him while riding away in a taxi.Brennan departs for a year-long anthropological expedition to the Maluku Islands, while Booth agrees to spend a year in Afghanistan, training soldiers to apprehend terrorists.