Nina is a small girl living in a big city. She loves her home, but she has a secret wish. It begins as a niggle in her tummy, then it grows to an ache in her heart, until one day it grows so much she can no longer contain it: 'I wish this city could be different!' she shouts. But what can Nina do? She's only small and small things don't count. Then she hears a little voice at her feet - 'everything starts with something small.'