For MMGM, I am recommending The War that Saved My Life by Kimberly Brubaker Bradley.
One of the most tragic yet overlooked problems in our world is child abuse, and, although The War that Saved My Life is set during World War II, this is simply the front for a saddening yet ultimately hopeful (and amazing) story. The main character, Ada, was born with a clubfoot (which is basically a disfigured foot). However, her mother never had the foot fixed, and she instead treated Ada as disabled, never letting her out of their apartment and often beating her or locking her in the "cabinet." Ada and her little brother, Jamie, end up leaving when their home of London is deemed unsafe and likely to be bombed, and they are given to a woman named Susan Smith, sharing the children's last name. This seems symbolic of the bond that soon forms, as Susan, although never having children or wanting to, grows to love the children, just as they begin to love her. Ada soon discovers what the world is like, and she is also conflicted, feeling at first like she is worthless because of her foot, which is what her mother ingrained in her, showing how abused kids cannot just easily decide that their parents are wrong. Ada eventually begins to become happier, learning to ride a horse and befriending several kids. Susan has her own problems as well, dealing with the loss of her best friend, roommate, and only real ally in the world. This book is so amazing that this review does not do it justice. Whether being read by a kid, a class, or an adult, it is incredibly touching, certainly deserving the Newbery Honor it has won.