I love Ms. McClintock's stye of illustrating.
Adele and Simon travel from Paris to visit their Aunt Cecile in New York City. By train she takes them all over the United States (a map displays their travels on the end pages). In each city, Simon, of course, loses one of his possessions. The reader can find it in the illustration.
Tons of interesting facts about each location are in the back.
-Borrowed from the library.