What 13 little blue envelopes?

13 Little Blue Envelopes is a wonder book written my Maureen Johnson. It tells the story of a young girl, 17, Virginia Blackstone as she follows 13 Little Blue Envelopes around Europe. Each specific envelope has an important message and journey, that she is then sent on. While traveling around Europe, she slowly discovers who she really is and who her Aunt Peg really was.