I liked the plot. The woman is clearly really mentally unwell and we see the impact of that combined with her extreme religious beliefs in her child. Mental health is rarely talked about, rarely treated, and despite how much revulsion you have for what she's done, you also feel pity for her. I didn't like how the chapters from her POV were executed, but I can't really think of an alternative either. However, she was the highlight of the book for me.
I didn't like Art, and Marie and Maddie just seemed okay. They weren't characters I really felt a lot towards. I was invested in the case though, and I did like Richard as a character. I just didn’t understand why Art reacted so strongly to this case, and I feel like what happened to Marie was unnecessary and didn’t push the plot along!
While bluebird at my window wasn’t one of my favorite reads of the year, I like the plot and I wouldn’t say no to reading another book by the author. This isn’t a genre I really read, so giving it a solid three stars is good for me because with something like this I’m normally either at 5 stars or 1 stars.