It has been a while since I have read a book that makes me anxious while I read it, but this book certainly delivered on that front. I am grateful to @harpercollinsca for the advanced copy!

Emma is approaching her fortieth birthday, and her anxiety is going through the roof. Forty is also the birthday that pushed her mother over the edge, causing her to behave erratically, stop sleeping, and almost harm her children. So when Emma's anxiety starts leaving her with no sleep, and missing portions of her day, she worries she'll follow the same path. With her life unraveling around her, Emma can't help but think she's losing her mind - she's becoming a creature of habit in the night, her youngest appears to be afraid of her, and her job is in turmoil. As she continues to spiral downward, Emma struggles to make sense of everything that is happening to her.

This story was INSAAAANE. I was constantly experiencing anxiety over what Emma was experiencing, and I always find thrillers that can manage this to be quite excellent. At first I thought Emma was indeed going a bit crazy, but as the story came together and more information is uncovered, what ends up happening was startling! I didn't put the pieces together until the very end, and completely binged the ending for all the answers.

I've had Behind Her Eyes on my unread shelf for ages, and after this I will picking it up sooner than later!