There needed to be a way of getting the gang back together. We are given a view of what each is doing since leaving and a task of getting Cam out of the crosshairs of the politicians. There is a pivotal case which is being used against her and she is forced to work on it all by herself (with some occasional incompetent help). It is totally contrived but each principle needs to look at his or her life and weigh it against what they are doing. The reasons are quite diverse and work. The strained romance is still there for Brennan and Booth, so we have not been given anything in that department. I look forward to them looking forward.