The Map He Already HeldOn the eve of his thirteenth birthday, guided by a well-meaning teacher, Leo sat at his small desk and sealed his future into a time capsule. The main event was a letter, addressed to his 25-year-old self, written with the sprawling, hopeful handwriting of a boy."Dear Future Leo," it began. "By now, you must be a famous graphic novelist living in a big city. You've definitely traveled to Japan and you speak at least three languages. You're probably really tall and cool and you aren't afraid of anything. I hope you have a dog. Don't let