"You look Jewish," he says, and I feel something of pride and recognition. Not that we talk about that every day at home, but I know I have a Jewish grandfather: Levie de Vries.

Coming home I tell this excitedly to my father, who had gone into hiding during the war together with my grandmother at many separate addresses in the Netherlands. "You betrayed us" he shouts. I am shocked by this reaction. But at the same time it is the starting signal to find out years later what happened to my grandfather Levie....