While the book does not cover new ground, it does a decent job presenting its story.
Lee, a ten-year old girl, lives with her mothers in a dome that keeps them sheltered from the 'Outside'. Believing that the Outside is poisonous, the women inside the dome (no men! Lee doesn't even know what that would be) live a sheltered, predictable, controlled life where nothing is a surprise and food comes as tablets. When one day the dome is breached by a fallen tree, Lee's curiosity leads her to the Outside. There, she not only discovers real nature, but also a boy, and through him she learns a lot - about the false history of her kind that she was taught and that her dome is not the only one. But, most importantly, she learns that she won't be able to survive on the outside. Going back home reluctantly, Lee vows to forever keep the memories of this day in her heart...
There are tons of books out there about people living cut of from the outside world for whatever reason, so the basic concept is not new. However, the author expertly depicted Lee's thoughts and feelings, and her naive wonder at discovering simple things that are most common to us but utterly new to her. The ending of the book was really sad, but fitting (sometimes, a Happy End would just spoil the atmosphere). A short, but nevertheless satisfying in-between read.
(Thanks to librarything, the author, and the publisher for a copy of the book, all opinions are my own)