The Short Second Life of Bree Tanner (book review)
The actual (LONG) title of the book is The Short Second Life of Bree Tanner: An Eclipse Novella (Twilight Saga). It was written by Stephanie Meyer.
My slight Twilight obsession wouldn't allow me to skip reading this book. If you're obsessed... totally read it. If you're not obsessed... or even "I kinda liked them"... skip it.