The Berlin Boxing Club by Robert Sharenow

I read this story after one of my student aides said he would read it for me.  He bought it at the school book fair and when he finished he said, "I don't usually read books but this was a really good book." I'm interested in the book to recommend to boys but I also read it because my mother lived in Berlin during the Nazi rule.  She had really not ever talked about the time so when stories can flesh out the time, I take a personal interest.