It's a story about two characters struggling with their feelings and identities in a complex world. There are lots of twists and turns that keep you engaged.
Well, that's hard to say without having read it. Maybe there's a big plot twist or a new character introduction. But to know for sure, you should take a look at the chapter.
In chapter 19 of Can't Think Straight, maybe there's a big confrontation or a new relationship dynamic. It could also introduce a mystery or a resolution to a previous cliffhanger.