In today's conclusion of our four-part coverage of the Long Island Serial Killer mystery -- which has driven Mark to emphatically state that there will never be a multi-part episode again...maybe... -- Lindsay and Mark explore the very very many questions that still remain more than a decade after the Gilgo Four and many other bodies began to emerge from their extremely shallow graves. Who is LISK? Was Shannon a victim of LISK? What exactly happened to make a fairly simple case so absurdly complicated that there is very little likelihood of the families of the victim having some sort of resolution in the future. We hope you enjoy this episode, and don't hesitate to reach out if you have your own theories to share, or if you would like us to cover a crime that marked your childhood in a way you can't forget.