what the... what maked that sink hole?

I haven't read it but I saw the movie. It's based on the World War ll, and there is a boy who has a lot of money, lives in a giant house and his dad is a soldier. One day they went to live to another house neer a jail. The boy with a lot of money wanted doesn't know that the jail is a jail he thinks it is a farm. He goes neer the jail and makes friends with a boy in the jail. Then the book tells what happens. At the end the boys die.