Cosmology : The Science of the Universe
The fact that the chapters are largely independent shouldn't lead the reader into the trap of not looking at the book as a whole. It is an important contribution to the philosophy of cosmology, as it pulls together ideas from plenty of sources.
The book does adopt what I call the Stretchy Space view, which I'm not keen on. Also the chapter on horizons seemed a bit muddled, but this might just be that one diagram (21.7) was wrongly placed. The important thing is that there is a wide ranging discussion of topics, which enables the reader to recognise controversial areas.