I liked this a lot! 4.5 stars. Reminiscent of Neil Gaiman's Neverwhere. Looking forward to the next book in the series!

I'd put this on the border between YA and general fiction.

A fun, sci-fi horror novel. Giant monsters underneath the NYC Sunday tunnels? Sure! A quick, easy read, don't expect anything incredible from it, but an enjoyable book.

Compared to the first two books in the series, this one is my least favorite. It took me nearly a month to finish, I wasn't as hooked as I was with the other books. I still liked it and look forward to continuing the series, but I'm taking a break from it for now.

Fascinating. Slightly overwhelming amount of information. Definitely worth a read!