If you're looking for a bunch of great suggestions, there's nearly 100 on this post (and I'll definitely be reading more than just these three).
I finally decided on these three for the summer:
The Light Between Oceans // A Snicker of Magic // The Prize Winner of Defiance, Ohio: How My Mother Raised 10 Kids on 25 Words or Less
I'll write about each book at the end of the appropriate month here. I'd be THRILLED if you read along!