This book about the Marchesa Casati (1881-1957) is called "the definitive edition" about a lady of extravagant leisures. It is an excellent book reviving the roaring twenties in Europe and gives you a good insight into the lifestyle of the truly rich and famous through to the 1940s. Marchesa Casati, who was part of this set, is a source of  inspiration to the very day for fashion designers, artists and wealthy heirs: if you squander your vast inheritance, at least do it in style!