Disclosure: I was sent copies of these books in exchange for an honest review. All opinions are my own.
Today I get to share a series of books about World War II. It is historical fiction and the series is really interesting and fun. It is written by Adam Gidwitz. The series is called Operation Kinderspion. The series is for middle grades or ages 8 to 12. The first book is Max in the House of Spies.