This is an easy, pleasant book to read.
The book is structured in an episodic way looking at different aspects of paleontology, for example the evolution of whales, or the evolution of horses, by first looking at the history of the science in these areas over the last couple of centuries or so showing how knowledge of the science has gradually built up followed by a summary description of current knowledge on the subject.
The structure of this book is what makes it a comfortable (but not shallow) read. By focusing to start with on the history of an aspect of evolution, the author takes the opportunity to include a large number of entertaining anecdotes about early scientists and their quirks, which keep you interested and entertained, whilst the way that he describes there understanding of what the science is takes you from the intuitive assumptions that you initially had on the subject to the more counter intuitive facts that are the modern day view on an easy to climb learning curve. This is impressive science writing.
The book is modern enough that if you haven't took much notice of the science over the last four or five years, like me, you'll find that things have moved on......e.g. Previous reading made me aware that birds had evolved from dinosaurs, I wasn't aware that many dinosaurs that we traditionally think of as scaled were in fact feathered.
I really enjoyed this book, and would recommend reading it.