I'd give it 4.5 if I could. This is one of those unexpected delights. I didn't know the plot or even the genre before I started listening as I'd bought it years ago and never got around to reading it. I very quickly found myself completely engrossed. There was great modern quest with intricate puzzles and classic roles made relevant. It really spoke to the data loving problem solver in me. The only downside is the overwhelming one sided love of Google shown.