This may be my favorite episode. It has good writing and great characters. We get to meet Reid, who has been assigned to Frost. He is on his last legs as an investigator and his hope now is his work with our favorite detective. Unfortunately, he has addiction problems and a past that is suspect. In this offering we have two cases, both of which are the deaths of women. The first involves a woman whose body parts are found strewn over a railroad yard. She has been run over several times by various trains, but the odd thing is that her arm was found in another place. The second concerns a superb heart surgeon. She is a terse, driven woman who alienates her fellow, much less competent, colleagues. They recognize her talents but resent her methods. She has operated on a boy who has died. She had assure the parents that there would be no problem. During the operation, the primary surgeon's work is interrupted by her when he can't handle a complication. One day she disappears. The episode ends with a startling revelation when a young woman whom we have seen several times delivers a startling pronouncement.