"Seven years after her husband's death -- six since she read his final letter -- Holly Kennedy has moved on with her life. When Holly's sister asks her to tell the story of the "PS, I Love You" letters on her podcast -- to revisit the messages Gerry wrote before his death to read after his passing -- she does so reluctantly, not wanting to reopen old wounds. But after the episode airs, people start reaching out to Holly, and they all have one thing...