Happiness Falls by Angie Kim

I really can't say enough about this novel.  I picked it up after hearing its premise:  

When a father goes missing, his family’s desperate search leads them to question everything they know about him and one another in this thrilling page-turner, a deeply moving portrait of a family in crisis.

I'm thinking of a page-turner, a quick read, and a family portrait. It's so much more! And I learned so much! 

This book is an "exploration of neurodiversity and its effects on family dynamics with a mystery."  Eugene, the younger brother of the twin older siblings, "is autistic, nonverbal and has a rare genetic condition called Angelman syndrome."

There is so much to learn in this book, and it gives you a lot to think about, too. I highly recommend it!