Silly proof reading errors annoyed me, ie. Blurb talks about a lieutenant who's worked for 37 years. Inside the book, it's 31. Then someone is given 2 and a half hours to get somewhere. Leaves at 2.31pm. Arrives at 5.38pm. That's 3 hours 7 minutes by my calculations. But he says he was 25 minutes early, so that means he expected to get there at 6.03pm. Which is 3 hours and 32 minutes after he left. Make it make sense.