Two books that really got to me, I read a few years back are Curious Incident of the Dog in the Nighttime by Mark Haddon, and A Long Way Gone by Ishmael Beah.
The first, Curious Incident of a Dog in the Nighttime is told through the eyes of an autistic boy, and it explains everything he sees and feels as he is experiencing things. The book opens up with him in the neighbour's lawn, embracing their dead dog. It then continues on to how he reacts to this incident. The one thing about this book is because of the writing style, I found it difficult to read long stretches of it.
The second of the books, A Long Way Gone is the autobiography of a child soldier from Sierra Leone. This is quite a powerful book. Quite shocking and sad. Just the story of how he came to be a child soldier, and his mindset throughout the ordeal. And then how he came about to be rescued.