Bones returns tonight for its spring premiere, kicking off with the 15th episode of the fifth season entitled "The Bones on a Blue Line." This week's case involves a subway train accident caused by 60,000 gallons of flood water, which consequently results to the discovery of a partially skeletonized body from the overflow.
Unfortunately, Dr. Sweets was one of the passengers on the derailed train so he's now struggling with post traumatic stress, while his near-death experience drives him to make a drastic decision. The rest of team, on the other hand, are focusing on the victim, who is later identified as Martin Aragon, a professional ghost writer involved in a deadly love triangle. Booth and Brennan then question people who they suspect are involved with the case, including a pawn shop owner (James Madio) and subway worker McKenna Grant (guest star Clea Duvall).
Perhaps the most interesting thing about tonight's episode is the release of Brennan's second book, which has everyone tingling. But first Brennan must accommodate a nosy reporter named Riku Iwanaga (guest star Seiko Matsuda).