When did the Emotions truly hit for you?

Which book really started making you feel emotions? For me, I think it was book 5 where I really felt the weight and emotion the book brings. I knew it was only a matter of time, but I think it was when Donut went off on Bea that truly cemented the emotion.

Im all caught up on the books, so there is no need to worry about spoilers for me. But I tagged it spoilers for others not as far. So they enter at their own risk.