I haven't watch Outer Banks on Netflix, but from what I know about it, this does have similar vibes. A summer treasure hunt mystery, unveiling a darker past in their town. It really does have great summer vibes, and the treasure hunting aspect of it was fun. I haven't seen that very often in YA books. 

For the most part, the characters were pretty well developed. Casey in particular had a great character arc, learning the mistakes of her past and working towards coming to terms with what happened to her family. The new group of friends she made while treasure hunting were probably some of the best characters overall in the book.

There is a treasure hunt and some tense moments, but overall, the plot did feel a little slow. The stakes also didn't feel super high, even though they were? There was just a weird tension there. But other than that, this was still an enjoyable book.