The invoice remained unpaid for twenty-six years. It listed stone for a front step at a house owned by the quarryman's oldest friend. When his daughter found it, she wondered whether he had preserved evidence of a resentment nobody mentioned.
A penciled line at the bottom said settled in lessons. The friend's widow explained that he taught the quarryman to read more confidently after long working days. Neither wanted to call the arrangement charity, so they exchanged stonework for evenings at the kitchen table.
The invoice recorded a price because that was the quarryman's familiar way of valuing work. The annotation recorded the actual exchange. His daughter found practice sheets in the same folder, including several attempts to spell the friend's surname correctly.
She gave the widow a copy of the best sheet and kept the others. The debt had been settled in a form the printed columns could not hold. At the house, the original step remained sound. She stood on it before knocking, aware that the material beneath her feet and the words she had just read were two surviving results of the same agreement.