The first part of the book describes the author's experiences as a physicist and comments on some of the famous names in the subject. I have to say that he comes over as having an over-serious, 'headmasterly' viewpoint . He criticises Murray Gell-Mann for being too frivolous in the choice of names such as strangeness and charm for particle properties, so you can imagine what he has to say when he gets on to Richard Feynman.
The second half of the book looks at more philosophical issues including the nature of the mind, and the anthropic principle. My feeling here was that too much was crammed into too small a space. It seems just to say 'this is what I believe' without much discussion, which doesn't do justice to the depth of thought which the author clearly has given to these issues.