There is not much here in the way of concerning content. As you can imagine, the story revolves around a series of perilous events, but the author is very intentional to communicate the realness of what was going on while also keeping their target audience of children in mind. This is very well done. Never does the story go too far and become scary. All that said, while the author did what they could, there will be some readers where the idea of things like being captured by Nazi soldiers, hiding and running for their lives, no matter how light the author works to make it, may be too frightening. It may be worth reading one or two of the short chapters or even the whole book if this may be a concern. Note that the word torture is mentioned, but the book only shows questioning and manipulation for information. — The boy understandably fights some doubt as things get really hard all around him. This is again handled well in the story. For example, at one point he asks why God isn’t helping them, but then several occurrences happen that show clearly the reader that He is. Prayer and faith get more and more focus as time goes on to offset this. By the end he is praying to God for help. — The main character feels he is warned of something by God in a dream. This is again handled well as the author makes sure to have the young boy ask someone older about this and brings up a reference to remembering the instances where this happened in the Bible.
