Backwards Bluebeard
Both parts of this storyline jumped out at me, atmospheric and emotional. The modern Sylvia seems completely separate from the early Iris - a fully grown and isolated woman, artist in the wilds of New Mexico. But equally compelling is the not fully formed Iris, second youngest in a set of six sisters, and while she doesn't know it at the time her oldest sister Aster is set to wed, the only one to survive.