 Ignoring the warnings of Simon, Mrs. Soames, and Mrs. Gibbs, Emily returns to Earth to relive one day, her 12th birthday.She joyfully watches her parents and some of the people of her childhood for the first time in years, but her joy quickly turns to pain as she realizes how little people appreciate the simple joys of life.The memory proves too painful for her and she realizes that every moment of life should be treasured.