What is the author's tone in Hitler Youth: Growing Up in Hitler's Shadow by Susan Campbell Bartoletti?

Hitler Youth is a book intended for children and teenagers, perhaps late elementary school and older. As such, author Bartoletti is very careful to lay out the basics of World War II, considering her young reader may or may not have a familiarity with the war. For example, she explains in simple terms who Adolf Hitler was, how World War I indirectly led to World War II, the state of Europe in the 1930s, and other concepts.