This is a fast-moving adventure about young teens during the nazi occupation of Norway. A great introduction to the concepts of resistance and personal ethics. Does not delve too deeply into the gruesome details of WW 2. Appropriate (and interesting) for kids 10 and up, even for kids who don’t think they are interested in the history. Some Norwegian vocabulary is used throughout the story but it is always in context and is not a block to understanding what is happening. There is some choppiness to the storytelling — time jumps ahead in a few places with no explanation of why — perhaps it is because this is based on the true-life experiences of a teen spy. It gets 4 stars, though, because so many Holocaust books leave the reader feeling overwhelmed and defeated; this one focuses on resistance and hope. I enjoyed that very much.