I never thought much about the quiet rhythm of my mother’s life until a stranger in black started showing up at her door every Saturday.

My mother, Marian, was seventy-three years old. She lived in the same blue-gray house on Linden Street in Savannah, Georgia, where I had grown up. She was a creature of gentle habit. Most mornings she watered her camellias, drank Earl Grey at the kitchen table, and read paperback mysteries beside the big bay window.