Sarah and Hannah are on a cruise from San Diego, California to Sydney, Australia. Sarah, Hannah's grandmother, is returning to the country of her birth, a place she hasn't seen since boarding the USS Mariposa in 1945. Then she, along with countless other war brides, sailed across the Pacific to join the American servicemen they had married during World War II. Now Hannah is the same age Sarah was when she made her first journey, and in hearing Sarah tell the story of her life, realises the immensity of what her grandmother gave up.
