I am a sucker for any great cyclists biography. Paul Howard's book about Jacques Anquetil sets a new highwater mark on just about every measure.
Anquetil was the first cyclist to win the Tour de France five times, the first to win all three Grand Tours and the first to win the Tour and the Vuelta (in the days when the Vuelta came first) in the same year.
However his domestic arrangements were even more extraordinary. You'll have to read the book to even start on that area!
He raced from 1951 until 1969 so his career overlapped briefly with the great Coppi at one end and Merkx at the other.
A fascinating book.