Interesting enough, but really there is nothing amazing about this book. 
 I'll sum it up in a few lines. 
 We make silly mistakes when not doing things we should really be doing. Checklists are a way of making sure we don't forget these things. They can contribute hugely in fields as disparate aviation, building and medicine. They demonstrably reduce errors. 
 And that's it. 
 Hard to disagree with, illustrated with interesting, well written anecdotes, but that is pretty much it.