Jackson and Shevi live at opposite ends of the social spectrum in a place where body weight is directly proportional to social status and success. I Town produces electricity with the renewable resource of human effort, people walking on treadwheels. She’s a big girl betrothed into one of the largest Ironclad families in I Town. He’s a skinny kid, a diminutive or Dim, whose only hope other than scavenge a living from crime is peddling heavy old novels to the wheel walkers. Both Shevi and Jackson have good reason to ignore the attraction they feel for one another. But the attraction is there and it grows stronger each time they meet, threatening everyone from Shevi’s future in-laws to Mr. Myrtle, a little man determined to champion the status quo by keeping Dims in their place.