Harold Fry is an unremarkable man who has made mistakes with all the important things: being a husband, a father and a friend. And now, well into his 60s, he is content to fade quietly into the background of life. Until, one day – Harold learns his old friend Queenie is dying. Harold leaves home, walking to his post office to send her a letter. And out of the blue, Harold decides to keep walking, all the way to her hospice, 450 miles away.

For Gwen, it's always 1999. The face in the mirror is unfamiliar and her partner isn't recognizable to her despite waking up together every day. Joe's past is coming undone and his partner, Sarah, fears she will be forgotten. A doctor refuses to give up on them, determined not to let them unravel.

Daniel's attempts to come out to his parents don't exactly go to plan. With his mother due home any minute its a race to the finish line to break the news to her. But what will she make of this?