What Is the book 13 little envelopes about? By Maureen Johnson

It tells the story of a young woman who embarks on a journey throughout Europe by following instructions left to her in letters from her aunt.

Answer: here's a summary but change the words around some

Explanation:

Virginia (Ginny) Blackstone, a seventeen-year-old girl who is on summer break before her final year of high school, has received 13 blue envelopes from her self-proclaimed "Runaway Aunt" Peg, who has passed away. Ginny is told that she is about to leave for several weeks and will travel to foreign lands.