Skeletal remains are found in a pond in a national cemetery. Dr Temperance Brennan, who specialises in forensic anthropology, will try to identify the body.
As the BAU investigates targeted killings in Tampa, they also deal with their own feelings about the loss of Prentiss.
Eli's flashbacks help him better understand his brother and give him a chance to say goodbye to his father; Taylor handles a divorce in which the parties cheated with each other.