When, in Moby Dick, Ahab disappeared, tied to his nemesis, only one man survived to tell the tale, Ishmael. The story, it appeared, had ended. But stories never really end. What happened thereafter to Ishmael, condemned, for a while, to repeat his account as if there were a lesson to be learned, by him or those to whom he repeated a tale which had a mystery at its heart? Was the white whale more than a simple fact of nature and what drove a man to...