Flying Solo, by Ralph Fletcher, describes the adventures of a fifth grade class as they attempt to survive a day with no teacher and no substitute teacher. They are literally "flying solo". The story revolves around Rachel and how she is struggling with the death of a classmate, Tommy Feathers. The day alone gives the kids a chance to assert their independence and demonstrate their ability to be responsible as well as a chance to heal.
This book has many great themes, but integrity has to be the strongest. The kids have many opportunities to practice doing what they know is right. They must manage their impulsivity and stay on task even though no adult is monitoring them. I love the relationships that come out of this book.