After deep research and expectations look stunning, the remains of people are found hidden in South Carolina. That will make investigators start looking for hidden reasons about it. Investigations begin amid a deep flood, where Simmons and JJ are sent to track a large trail of clues dating back to an ancient and mysterious time.
The manhunt, while exciting, was almost secondary to the episode's theme. As amplified by Prentiss' talk with Reid on the plane, this was about how the BAU is and has always been a family which has each other's backs.
