I was starting this book in year 6 and I find it spellbound after completing it. It really makes me think of the experience living in Poland in WW2. Not only that, it helped me and many of my mates develop reading! I suggest this to people who are into the war and mystery genres and a series of dark events. I'd also like to say that this is suitable for children grade 4 and above. If you also like this book, there are sequels after this. (Then, now, after, etc.)