I made some comments on Dirac earlier to say that he made one contribution that seems to me quite unique: predicting from fundamental (though new) principles, and even aesthetic criteria, not just the behaviour of simple constituents of the world, but their existence
The book suggests he and his time were right for each other and for this discovery, that later as well as earlier his style would not have (and did not) yield such dramatic results. (This could be said for Einstein too).
From the book I now know another thing I would have had no way of guessing. He went to the same school and at the same time as Cary Grant.
No a lot of people know that.
Nor did they.