This book talks about how humans think their way through puzzles. It mostly does this by walking you through several classic puzzles. If you're already somewhat jaded of the classic puzzles, then long stretches of this book might be sloggish; be prepared to skim. But if you're interested in thinking about thinking (especially thinking through tricky things), then you'll want to put the brakes on the skimming and see how a brain can build up a chain of reason around these.