Bones: Season 2, Episode 15

2 - 15: Bodies in the Book

Three separate bodies are found murdered exactly the way Brennan wrote them in her new book. However, the killer's method was different every time, leading the team to believe that it was not one but three killers. Booth and Sully become concerned for Brennan, while she insists she can take care of herself. This increases tension between Sully and Brennan, straining their relationship. Booth tries to help them along, apparently fine with the couple. At the end of the episode, Sully and Brennan reconcile and kiss and Booth, walking away, looks back sadly.