A Wrinkle in Time by Madeline L'Engle (1918 to 2007-New York City) won the very prestigious Newberry Award for best children's literature in 1962. You will also find it mentioned by many book bloggers as among their very favorite books of their youth. I have been wanting to read it for some time now and I was very happy to find it in National Book Store in Trinoma Mall. It is very much a "feel good book".
A Wrinkle in Time is a cross between science fiction and a Christian fable. It plays with the conventional notions of time and space and solid objects. It takes us to strange planets (places besides earth at least) and introduces us to aliens with names like "Aunt Beast", "Mrs Who", "Mrs Whatsit" and "Mrs Which". They may look strange but in the end they are kind of like alien Mary Poppins.
There is an excellent post at Things Mean a Lot that goes into detail about the plot and the themes of the book. There are links on that post to other reviews.
A Wrinkle in Time is a book for children but it also has the power to make adults think. It is well written and easy to read. With the qualification that this is almost a child's book rather than a Young Adult book, I would recommend it for adults who like an occasional Young Adult book. I would be happy to see my 12 year old daughter reading this and I think she would like it a lot. A Wrinkle in Time supports the kind of values a parent of almost any creed or religion would like to see their children learn.