Having read and loved Atkinson's three mysteries, I'd put off reading any of her "literary fiction," mostly because the term "literary fiction" really bothers me because it basically just means "not genre." Anyway, everything I loved about Atkinson's mysteries was here as well: amazing characterization, interesting metaphors, perfect pacing and multiple narrators and storylines that all work together.
Ruby Lennox starts narrating her life at the moment of her conception, and each chapter in the book is a snapshot of one event that happened in each year of her life. Each chapter is followed by a footnote that relates to the chapter but examines the history of Ruby's family. As time passes, she (and you!) learn more about the secrets of the Lennox family. There eventually is a revelation that is a little bit unbelievable, but overall it didn't really distract from the excellence of this novel.