I hate to admit I've never read A Wrinkle in Time. It seems like one of those books everyone should read. I have to say I wish I had read it years ago.
Wrinkle in Time centers on Meg, her precocious brother, Charles Wallace, and their friend, Calvin, as they try to rescue her father. There's a lot packed in the book -- there's time traveling. The children's father had been working on a tesseract, which is a wrinkle in time. There's also an evil thing -- the black thing -- that is threatening earth and other planets. There's the battle of the individual versus the group/ freedom of thought.
Parts of the book reminded me of 1984 -- full disclosure it's been years since I've read it -- such as when they visit a planet where everyone acts identically. I'm looking forward to reading the rest of the series.