This is the story of Lydia Lopokova, who was a famed Russian ballerina and wife of John Maynard Keynes, the economist. I found it fascinating - I read other things in between but kept going back to it.
The story has a number of distinct phases, which are all equally fascinating - her early life as a "stage school kid" in Tsarist Russia, her international career, the courtship with Keynes, her married life and old age.
For me, the most interesting stuff was her early adult life on the fringes of the Bloomsbury set, never quite being accepted by the Virginia Wollfs of the world because she was too unconventional, although they set themselves up as dismissing convention! The relationship was Keynes was fascinating, too - she "converted" him from homosexuality, and they had a lovely, tender relationship.
It was a great window on the 20th century from the perspective of a unique character.