Some time ago Rafi Zabor sat down to write a brief narrative of the year 1986. That was the year he set out across two continents in a used Mercedes--"Wabenzi" is the Swahili word for a member of the Mercedes-owning class--to buy a grave stone for his friend Mahmoud Rauf and to outrun the shadow of his own parents' recent death. But like a boat against the current, the writer was drawn back into the past: his father's escape from the Nazis, Rafi's...