Gone Girl by Gillian Flynn
I'm a bit behind the times reading this one. I was browsing my library ebooks awhile back and added my name to the reserve list, then promptly forgot about it. Received an email a few days ago that it was available.
It did not grab me from the beginning...took quite awhile, actually. But this is a time that I am really glad I stuck with it, because I am definitely hooked now.