What are the most heartbreaking episodes?

First time watching the show and I just have to say that season 9 episode 12 absolutely broke me. The torture and murder of 24 women and Lauren's suicide was so tough to watch. Shows like this never effect me but for some reason this one ep shook me to my core. Even the William Lewis storyline didn't effect me as much. Those screams on the TV they found when raiding Moore's wharehouse were horrific and I felt so sick when they discovered poor Amy. I definitely understood why Lauren did what she did.