I get why everybody and their mom loved this book when it came out. In recent years, I've seen a lot of ppl say something along th lines of "well, it was a novelty backt hen, but if you read it today/read similar things beforehand, you'll guess the twist." And yeah, I did, at least an important part of it. But not all of it. And even if I did, I think I'd still been happy with this.
The execution was very well done in my opinion. The atmosphere was very tense and dense - maybe helped by the fact that it felt like summer while I listened to the audiobook (listened to it in German, was very happy with the narrator). This family of very priviledged people, Cadence trying to reflect on that, the whole mystery surrounding the summer a few years back... captivating to listen to. Even the thing I saw coming didn't change that, instead I wanted to understand the how and why and witness the reveal.
Not gonna lie, my heart was at least a little broken by this book. Not in a "I will think of this forever" kind of way, but it made me feel a lot. 
I also feel like this could be an important read for teenagers, because while being a well done mysterious, it also deals with questioning elitism, which I liked.

and it's downfall of a family, which is just fun to read about in a morbid way