This is the very first book that I've read about what life in North Korea is like. Suki Kim goes undercover as a journalist disguised as a missionary disguised as a teacher in order to work at a prestigious university educating the young men of North Korea (The subtitle of this book is: My Time with the Sons of North Korea's Elite.)
Fascinating, despairing, and compassionate.
By the way, another way I get book recommendations is from an unlikely source, Peter King of Monday Morning Quarterback. Even if you're not a football fan, there are some interesting titles on his list of holiday book recommendations. That's how I heard about Without You, There Is No Us.