This is a book that I never would have read, had I not been in a book group where it was selected. But having said that, I'm glad I read it, even though it is a bit padded with name-dropping and details that seem superfluous. It's essentially Richardson's memoir of his impression of the mid 20th century European art scene with Picasso at its center.
Cooper enters the picture as an art historian and collector, a friend of Picasso, and a pretty unlikeable person. He was wealthy (and although unstated, probably explains why Richardson, a much younger man stayed with him for twelve years, aside from them being gay lovers), extremely petty and vindictive, savaging anyone who disagreed with him. Near the end of their twelve years together, Richardson wrote a critical art piece that outshone his mentor, Cooper, and they acrimoniously split up. Hence, the title.
The virtue of the book is to give the reader a sense of the world of art during this period, not the paintings in themselves, but the business end, the wheeling and dealing of collecting, buying, and selling of paintings, particularly anything done by Picasso. Cooper and Richardson renovated a chateau in southern France near where Picasso lived, and filled the walls with works by Picasso, Braque, and Leger. It was a small world and at the time had not yet been overrun by tourists. A who's who list of friends, wealthy and famous, would drop by to visit Richardson and Cooper It was a time, too, when the paintings had value, yes, but would not be worth the astronomical sums that they would later bring at auctions.
Richardson's memoir has a sharpness to it that is critical of the monstrous ego of Cooper, as if this were payback time for the grievances that Richardson suffered at the hands of Cooper, one being a burning of all of his personal effects. Richardson who began as a journalist, obviously took copious notes to produce such a detailed account of Cooper's life, centered in Provence.
Richardson has also written a three volume (and a fourth is pending; Richardson is now 94) critical biography of Picasso and his works, undoubtedly Richardson's major accomplishment. This book, while of some interest, to Picasso lovers, seems like a side effort.