Liar by Justine Larbalestier

Micah fully admits she's a liar. She does it a lot. Sometimes it's small lies, sometimes it's big lies, sometimes there's a little truth mixed in, but does she ever tell the whole truth? She promises the readers she's going to try.
A classmate, Zach, has been missing and then found dead. Micah breaks her story into before this happened, after it happened, and various histories (history of me, history of the school, family history, etc). Each bit reveals more and more of Micah, her classmates, her family, and her history with Zach, which is more than anyone ever expected.
She becomes sort-of friends with Zach's girlfriend Sarah and his best friend Tayshawn, and ordinarily Micah is in the background of her school life, but with Zach's death (and a large portion of the school thinking it was Micah who did it) and her relationship with Zach, Micah is suddenly under the microscope, not where she would like to be. These three very different students are grieving for someone who meant a great deal to each one of them, and that's a great dynamic to see, how they are drawn together.
Periodically Micah will reveal a lie--a tiny one usually, but a lie nonetheless. It makes you rethink her entire story. When one of the biggest reveals come, it left me thinking it was just an excuse Micah had used, another lie, and that left me on uneven footing for the rest of the book, as a great deal of the story required the reader to believe Michah's reveal.
It's not made clear in the book why Micah is writing this: is it just for her sake (which is what she claims) or is there a darker reasoning behind it? The book is broken into three parts, all of which have Micah claiming to tell the truth.
I was definitely interested in this book, having read many reviews of it and hearing a lot about it, and really, it's an unusual idea, and then the werewolf part came in. I'm not against supernatural characters, I just wasn't expecting one. So perhaps it was my fault, but it threw me for a loop.
One thing I did love about the story is that I still don't know if Micah was being entirely truthful. I think that was pretty awesome to have this great story, and the reader still is not sure what is laid out before the reader is actually what happened. A well written, engaging story (if you can suspend your disbelief), Liar is recommended for readers interested in mysteries.