A really cool children's fantasy/sci-fi book written by Madeleine L'Engle, published in 1962. It tells the relatively short yet fascinating story of a New England teenage girl who goes on a journey with her brother and friend/boyfriend to save her father. It is a tale of science, love, mystery, good and evil, and portrays a great message of individuality and creativity. It won a Newbery Medal and for good reason, it's awesome!
It is the first in a series of something like 6 or 7 books, all which are good but not as good as the first one.