For a relatively short book, ostensibly about a groundbreaking artist and his web of relationships, it is quite unfocused.
A good portion of the book is about an interesting and likely overlooked artist, Beatrice Woods, who was in love with Duchamp and was briefly the lover of his friend, Roche (who may also have been Duchamp’s lover; certainly, the book is clear that the two men were involved in threesomes together).
Not that there wasn’t some interesting stuff here, but Duchamp remains a cipher and barely a player in the book. Why not just right a biography of Ms. Woods? Maybe the publisher said they needed to include someone better known to make it sell.