Oxygen: The molecule that made the world
The book also has plenty to say about the role of oxygen in evolution. Seeing oxygen as a poison gives a new outlook on the coming of photosynthesis and of multicellular organisms. Lane introduces some of the recent ideas which have revolutionised our understanding of the first few billion years of life on this planet.
As for difficulty, well I would say that a complete beginner might struggle with some of the book, but it's certainly easier than his 2005 book on Mitochondria - Oxygen would be a good starter for those who find his later book hard going.