I was unexpectedly blown away by a post-apocalyptic book called Wool by Hugh Howey, the first one of the Silo trilogy. Hard to say what did it exactly, just the overall combination of plot, storytelling and pacing. I read (or rather listen to) a lot of fiction and sci-fi specifically, and can't recall the last time I was this much into a book. About to start the second one, and also looking forward to the TV series based on it.