Lydia is a wealthy merchant who dyes and sells purple cloth to those who can afford it. She lives a life of luxury but has a single regret — she hasn't heard from her son in years. He turned his back on "serving the rich", and has become a teacher to the poor. When she at last receives a letter telling her where he now lives, she resolves to travel to him — though she doesn't realize how difficult and transformative the journey will be.