Boy in the Striped Pyjamas4 books in series
The Boy in the Striped Pajamas Publisher's Summary
If you do start to listen, you will go on a journey with a nine-year-old boy named Bruno. (Though this isn't a story for nine-year-olds.) And sooner or later, you will arrive with Bruno at the fence.
Fences like this exist all over the world. We hope that you never have to encounter such a fence.