The fallibility and inherent untrustworthiness of memory isn't a particularly original subject, but the author handles it in an interesting and original way in this novel. One thing I wanted to share is that I didn't read this book for a long time after it was recommended to me because I believed I already knew a key plot point that I thought was an important "reveal" -- it isn't. So if you are already aware of the central conceit of the story, don't let that stop you from reading it.