An Na's writing style is really fantastic. The story is told for the perspective of Young Ju who immigrates to the US with her family when she is five. The language evolves as she grows up. Making you feel as if a five year old, then 10 year old, then 15 year old, then 18 year old is telling you the story. She does a particularly phenomenal job with the narration at the beginning.
The story is beautiful and heart wrenching. Be ready for some emotional rough patches, especially towards the end of the book. I highly recommend this book. It's a quick, easy read of high quality.