Julia Wynn’s father is a man with a mysterious past. He was a successful lawyer in the United States and a model family man, but his past remains a secret. Even his wife and children don’t know many details about his life. When he unexpectedly disappears, neither the police nor relatives can determine where he is. The only clue is a letter that his daughter finds four years after his disappearance. This love message is addressed to a woman named Mi Mi, living across the ocean. Julia decides to embark on a long journey full of uncertainty—to learn to understand and feel the hearts of other people.