Lou spends every Saturday with Grandad and Pops. They walk to the library hand in hand, like a chain of paper dolls. Grandad reads books about science and design, Pops listens to rock and roll, and Lou bounces from lap to lap. But everything changes one Saturday. Pops has a fall. That night there is terrible news: Pops will need to use a wheelchair, not just for now, but for always. Unable to cope with his new circumstances, he becomes withdrawn and shuts himself in his room. Hearing Grandad trying to cheer up Pops inspires Lou to make a plan. Using skills learned from Grandad, and with a little help from their neighbors, Lou comes up with a plan for Pops.