The BAU is called to Atlanta, Georgia to investigate the deaths of two prostitutes. Each victim was stabbed multiple times - indicating anger and strength - with the dead bodies placed carefully in different parks in the outskirts of town. The differences in the kill and the body placement indicate that there are possibly two unsubs, one dominant and one submissive who exist in a co-dependent relationship. In addition, $250 was found on each victim, meaning that theft was not a motive, and the victims were not sexually violated, meaning that sex was either not a motivation or that the angry killer is impotent. Similar bruising on the victims' thighs and a subsequent victim who is somewhat outside the victimology of the initial two dead lead the team to understand with who they are dealing as the unsubs. Meanwhile, Hotch is hoping that his participation the upcoming FBI Triathlon will mark a milestone not associated with the race itself. And Prentiss, Garcia and JJ plan on a girls' night out, which is difficult to arrange for a forgetful one.