Ginny Blackstone never thought she’d spend her summer vacation backpacking across Europe. But that was before she received the first little blue envelope from Aunt Peg.This letter was different from Peg’s usual letters for two reasons:1. Peg had been dead for three months.2. The letter included $1000 cash for a passport and a plane ticket.Armed with instructions for how to retrieve twelve other letters Peg wrote—twelve letters that tell Ginny where she needs to go and what she needs to do when she gets there—Ginny quickly finds herself swept away in her first real adventure.