Diana Athill is one of our great women of letters. The renowned editor of V. S. Naipaul, Jean Rhys, and many others, she is also a celebrated memoirist whose Somewhere Towards the End was a New York Times bestseller and a National Book Critics Circle Award winner. For thirty years, Athill corresponded with the American poet Edward Field, freely sharing jokes, pleasures, and pains with her old friend. Letters to a Friend is an epistolary memoir that...