The Sunset Protocol. The Luma Series, #3

Arthur Blackwood is eighty-seven years old, stubbornly independent, and running out of time. When a terminal diagnosis forces him to confront what truly matters, Arthur finds himself haunted by his greatest failure: fifteen years of silence with his daughter Sarah. Harsh words, stubborn pride, and a chasm that only widened with time. His unlikely ally is Luma, an AI home companion he never wanted.
But as Luma gently guides him through memories of his late wife Eleanor and the daughter he pushed away, Arthur begins to wonder if it's too late to mend what's broken - or if one letter might bridge the divide. The Sunset Protocol is a tender, deeply moving story about family, forgiveness, and finding the courage to reach out before the light fades.