This book was getting some buzz, so I put it on hold at the library. A bit of a wait. Audio and Kindle, I went primarily with the audio. There were three narrators, and three voices, a present day (2006) Katrine, told in first person/present tense. Then Allina (starting in 1938) is the main story (3rd person/past tense) but Karl gets a few chapters, and there's a couple from Marguerite Ziegler's POV. There were headers in the text, but not in the Table of Contents (just the section headers at the five Parts) ... I find it helpful to have the POV also listed in the TOC (if I wanted to go back and check, knowing I wanted a "Karl" chapter or "Katrina" chapter, without having to manually flip and search. Here though, sometimes the POV switched mid-chapter. 

I think I had heard of this breeding program, although more of a mention, not the main premise as featured here.  While the "Sunflower House" played a part, it didn't seem to be enough to be the title/cover. 

I appreciated the Author's Note at the end, telling of her inspiration and research and further resources. No BookClub questions ... not included in the book or even anything online that I could find. That can help me delve deeper and appreciate a book more, taking the time to think of things I might not have on my own. 

Things I note: Song SUNG ... Silent Night lyrics were written in the text, and in audio, the narrator sang the song (as the character was in the writing). Well done.   ProFanity x4 ... other words: careen, pogroms, loathing (notice it since Wicked came out). Some sex/rape, not too explicit that I recall.