Okay, for what it is - a MG historical fiction short story about two American brothers during WWII - it is not a bad book at all. It is very paint by the numbers, yet informative and entertaining enough for the target audience. The tone is too modern for a story that takes place in 1940s, but maybe that helps with young readers. My son would probably enjoy it if it was illustrated. The reading level is just above the reading levels of those beginning to read books, so maybe early MG. It is written entirely through letters the brothers send each other, so if the reader is every in need of an epistolary-type book for a reading challenge, here you go.