Sourdough or, Lois and her adventures in the underground market

A robotics engineer with little contact with the outside world is given a special culture for sourdough bread by some bakers across the street from her. And as she learns to bake, spreading her wares around the office, she is told of a farmer's market she might want to join. They are not receptive to her cooking so she joins a literal underground market where her food might be appreciated.