The “golden thread” symbolizes something for us. What is it?”(Book 2 Chapters 21-24)

The Golden Thread" refers to Lucie's hair, "the golden thread that bound them all together". There is yet a larger symbol at play here. It also represents hope and new life after the terror of the French Revolution. Lucy's golden hair juxtaposed against the matted hair of the evil Madame Defarge. Lucie and Charles' son, Sidney, also has golden hair. An innocent child with golden hair has been born out of the bloody revolution: this means there is yet hope.