As simple as snow

This is an interesting first book by Gregory Galloway, but nothing in it is as simple as the title suggests. The narrator is a teenage boy who meets Anna, the newcomer in town. Anna is an intriguing character & has an opinion on everything and even recommends books to him. Her hobby is writing obituaries of all people who live in that town! Then halfway Anna disappears, & then it is a search for Anna thru codes, buried maps etc. This book did get the ALA Alex award for 2006. Alex awards are given to 10 books that are written for adults and can be recommended to young adults. Everything in the book is a clue even the ending!. Try deciphering it.