One of my favorite children's novels is Tuck Everlasting, written by Natalie Babbitt [J BAB]. In brief, the book is a exploration of immortality, and raises the question, "is living forever a good thing?" The subject is a rather "heavy" one for kids, but the book is well-written and has certainly sparked some active classroom discussions--thus its longevity in print.
The book was first published in 1975, so this is its 40th anniversary year. It was adapted and released as a major motion picture by Disney in 2002 [DVD TUC]. Alexis Bledel of Gilmore Girls fame stars. It has morphed again into a choreographed musical theater piece. Tuck Everlasting previewed in Atlanta on January 21 and officially opens on February 4.
I am skeptical about the book's suitability as a musical, but, I'll reserve judgment.
If you, as an adult, haven't read the book, I can certainly recommend it. It would make a good choice for a book group, too.