Caught spray-painting graffiti on the wall of a house in Green Meadows, a neighboring and only slightly more affluent subdivision, Hermes Hawthorne is diagnosed with ADHD. This does not console Frank Brickman, the angry homeowner whose house Hermes has defaced. Frank conspires to build a wall to separate the two subdivisions, but how high must a wall rise to ensure the separation of barely distinguishable classes in a modern-day American suburb?