Chester Dunhill is a writer who has long lusted for a copy of The Historians’ History of the World and has a fan who is willing to sell him one—but alas he has thrown away the envelope which has the man’s address and only has the letter itself as a clue for how to find him.

This story is based on a certain amount of truth from Asimov’s personal life. For one thing, he himself lusted desperately for The Historians’ History of the World (someday I need to find a copy myself to glance over to see exactly why). He also was more than once annoyed by fans who don’t put their return address on their correspondence, since he routinely threw away envelopes. Between the two, Asimov has managed to provide the backstory for a mildly interesting geography puzzle with a plausible solution (for all I know, having only been to the city in question twice, each time on my way to somewhere else).

Found In

	Puzzles of the Black Widowers