<p>In a future of huge enclosed and isolate communal living spaces, spies must want to "come in" from the cold, right?</p>

Atomic Julie - The Spy in the Elevator by Donald E. Westlake, part 2 of 2

Award-winning anthology series of audio dramas, in the realm of the strange, speculative, and supernatural.  Some episodes include more mature content, but have warning labels.