Buy from Amazon
John Gribbin and Jeremy Cherfas
The First Chimpanzee
As the first claim is so certain (and so doesn't need much argument) and the second so speculative (the authors admit it might be wrong), this book isn't so much about trying to persuade the reader of their point of view as you might think. Rather, since it is aimed at a popular science readership, it gives an easy to read introduction to some of the techniques used in dating evolutionary progress, in particular the evidence from molecules such as DNA. There are also plenty of comments on the conservatism of the palaeontological establishment - the idea of a recent split is still being argued, and the idea of a human-like common ancestor seems to have been largely ignored, despite the fact that the authors put it forward about 20 years before.