The Unlikely Pilgrimage of Harold Fry (Rachel Joyce)

This is a charming, gentle, life-affirming book, though there is a lot of dark material there.  Harold and Maureen are living in a cold, empty marriage in a cold, empty house, when Harold gets a letter saying that an old friend is facing death on the other side of England, and it shakes him. He heads out to mail her a letter of sympathy, but simply keeps walking, heading north to be with her in her last days. His walk takes on mythic dimensions, and helps him and Maureen work separately on the issues that keep them apart. The big reveal toward the end is not actually much of a surprise, but it all fits together. I found it moving and engaging, and felt that I got to know the characters well.