Recently retired, sweet, emotionally numb Harold Fry is jolted out of his passivity by a letter from Queenie Hennessy, an old friend, who he hasn't heard from in twenty years. She has written to say she is in hospice and wants to say goodbye. Leaving his tense, bitter wife Maureen to her chores, Harold intends a quick walk to the corner mailbox to post his reply but instead, inspired by a chance encounter, he becomes convinced he must deliver his message in person to Queenie--who is 600 miles away.