Just goes to show that you're never too old for Children's Classics! 
 Lovely Children's book. I wish I had read this at a young age, I would have loved it as much as I loved Matilda. I had an affinity for genius children, I fancied myself as one of them :P. 
 This is a book promoting love, understanding and "good" vs "evil". It makes a couple of christian references and advises against hate and destructiveness. L'Engle also encourages acceptance of foreign and different creatures (or people in the real world). She teaches that it is okay to be different. 
 Definitely a book to read to my nieces and nephew when they grow older.