When Lu is waiting alone outside school to be picked up after almost all the other children are already gone, various adults -- all of whom she’s met in some capacity before -- offer to take her home. But she refuses. She doesn’t really know any of them, as she illustrates by asking herself questions about silly details of their lives. Finally, in a visual surprise to the reader, Lu agrees to go with a punk teenager -- her brother.
This story illustrates the principle of a child going home from school with no one other than whomever her parents have said she should go with, even adults she’s met before. Ends with a prompt for parents and children to create a similar "safe" list.