I'm not sure about the HC Chester - whether that's a real person or some sort of fictional device - but I have avoided Lauren Oliver's books since she's never written one which has appealed to me enough to want to read it. Now I know why! This one did appeal until I started reading it; then I found it was definitely not to my taste at all, and I DNF'd it rather quickly. Yes, it's not aimed at me, but I have to wonder if those at whom it is aimed would like it. My own two kids who are broadly in that age range would not give it the time of day, I'm sure.
The book is part two of a series of loosely connected adventures, I believe, featuring the same mystery-solving kids, and I know this is what Big Publishing™ pushes authors into, and authors dream of getting that series sinecure so they don't have to think-up good ideas for stories anymore, but I am not a fan of those authors who chase easy cash, and I don't read series very much for the same reason I tend not to go for overly long novels: I'm very easily bored by a surfeit of sameness, and books like this are all about same-old, same-old: once you get through that introductory portion, whether it be the first twenty chapters or the first volume.
There are exceptions which are rare and treasured, but this was not one of them. I didn't like the charcters or find them interesting. It took way too long to actually find a mystery (I was still unsure what it was when I quit reading, but it seemed like maybe the 'murdered' wife wasn't actually dead at all). Maybe I'm wrong in that guess, but what I do guess right is that I'm done with Lauren Olvier now.