This ep's a doozy!  I somehow convinced Grace Atwood to read the book If You Tell by Gregg Olsen that recounts the story of Shelly Knotek as told by her daughters and husband. To say this book will give you nightmares is an understatement.  Shelly Knotek tortured two people to death all while her children watched. She lured people in by love bombing them only to turn that into the sickest form of torture and abuse. No spoilers for this one - it's truly disturbing!