The Correspondent: A Novel
Epistolary: a style of novel, narrative, told in the format letters. In more modern formats, text messages and emails.
Seen it before, I think. Mentioned in passing, Stoner (thought I read that novel).
There are years of letters, supposedly hand-written, passing from the main character to her children, friends, fan letters to famous authors, tracking correspondence over a law career, and after. Great depth of detail, evocatively rendered. Bittersweet and poignant, touching on those questions, more than answers, birth, life, death.