The teams heads to Jacksonville, Florida after a pumping crew discovers a mass grave off shore. From the several skeletal remains, Reid is able to determine that there is no biological commonality to the victims, they crossing several age categories, ethnicities, and pre-death health conditions. He is also able to determine that the unsub is killing on average once a year and that he has a professional fisherman background from the knife skills used on the bodies. The team decides to go public and ask for those with missing loved ones to provide some background as to the circumstance of the missing person and some DNA to match to any of the found bodies. When they are able to identify some of the bodies, they do start to find some common aspects specifically to the stories of why they went missing. Identifying the latest target may lead them to the unsub. This case is especially difficult for Morgan, whose missing cousin Cindy may be one of the victims.