"The Subtle Knife" is the second book in "The Dark Materials" trilogy. This book introduces a whole new story line to the story: that of young Will Parry, a boy from "our world" in Oxford. Will decides to undertake a mission to discover the fate of his father, the Arctic explorer John Parry. Will meets the young girl Lyra Silvertongue, protagonist of "The Golden Compass" and together they undertake the search for Will's father.
This book is even more magical than the first book in the trilogy.
The story in this book is the second of the Dark Materials trilogy and should not be read before reading the first book. That being said, I loved this trilogy and feel that it surpasses even Harry Potter (another series that I love). The book is written for young adults, but I've known several older adults who've read the book and enjoyed it tremendously.
This book is listed as a young adult but I have read the trilogy twice now as an adult and throughly enjoyed it. The Subtle Knife is the best of the trilogy. Read it the first time when my daughter was in elementary school and reread the series after seeing the Golden Compass. It keeps you on the edge of your seat and reading just one more chapter before you go to bed.