The Lovely Bones has an unusual method of narration. It is told in the first person; this is a common method. What is uncommon is that the first person narrator in this book is "omniscient". That means she is all seeing and all knowing. She can see into the minds of all the characters. Usually a first person narrator is limited to his/her own point of view. Omniscience usually goes with the third person "eye of God" technique so common in novels in the19th century. The third person eye of God method is when the author is all seeing and all knowing.
The method used in this book is not unique though. A book I am reading at the moment "The Book Thief" is narrated by Death. Death, ot the Grim Reaper, is telling the story of a young girl who is experiencing the Holocaust in World War Two Europe and can't quite make himself kill her. (It's a good book so far and not as grim as it sounds.)
Since the early days of the 20th century, novelists have been experimenting with different ways of narrating. The last few decades have seen the post-modernist era where a more self-conscious style has often been adopted. It's no longer always fashionable to make the book totally realistic but to use distancing techniques which force the reader to accept it is a work of fiction and apply more thought or awareness to the process of reading.
How does the first person ominiscient work in
The Lovely Bones? It enables Susie to trace her whole family over a period of 8 years which is obviously the whole point of the book. It also enables us to look at a tragedy like what happened to Susie in an imaginative and fresh way. We see the victim's point of view as well as the survivors'. As an imaginative exercise I think it works very well.
Another question is: does Susie maintain her omniscience or does the narration simply slip into third perosn from time to time, such as when we read about Harvey's background? does it matter?