The back cover of the book reads:
"12-year-old Piet finds himself experiencing extraordinary events in German occupied Holland during the summer of 1944. When he makes friends with the son of the town's german garrison commander, the villagers start to gossip. In the course of their adventures they stumble upon secret activities that if discovered could result in Piet's whole family being arrested and sent to prison."
It doesn't appear to be on amazon at the moment but it is on a site called lulu
I'll be posting a review as soon as I read it.
Way to go Adrian...