Mellon: An American Life by David Cannadine
I read a review of the book which interested me, I had also read a biography of Carnegie, so rampant capitalism in 19th century Pittsburgh interested me. It was all readable.
The history of the art collection was not something I was aware of and the connection with Frick (also an art collector). The art sales of the masters from the Hermitage museum by the Bolsheviks was pretty amazing.
I read this on holiday travelling to Spain. I remember sitting outside a tent at a great campsite near Limoges reading it.