At length it occurred to me that if someone was trying to find my mother I’d need documents to prove the relationship. I got up from the floor and pulled the trunk into the hall. On top lay her black silk concert gown: I’d forgotten wrapping that in tissue and storing it. In the end I found my parents’ marriage license and Gabriella’s death certificate tucked into the score of Don Giovanni.

When I returned the score to the trunk another old envelope floated out. I picked it up and recognized Mr. Fortieri’s spiky writing. Carlo Fortieri repaired musical instruments and sold, or at least used to sell music. He was the person Gabriella went to for Italian conversation, musical conversation, advice. He still sometimes tuned my own piano out of affection for her.

When Gabriella met him, he’d been a widower for years, also with one child, also a girl. Gabriella thought I ought to play with her while she sang or discussed music with Mr. Fortieri, but Barbara was ten years or so my senior and we’d never had much to say to each other.

I pulled out the yellowed paper. It was written in Italian, and hard for me to decipher, but apparently dated from 1965.

Addressing her as “Cara signora Warshawski,” Mr. Fortieri sent his regrets that she was forced to cancel her May 14 concert. “I shall, of course, respect your wishes and not reveal the nature of your indisposition to anyone else. And, cara signora, you should know by now that I regard any confidence of yours as a sacred trust: you need not fear an indiscretion.” It was signed with his full name.

I wondered now if he’d been my mother’s lover. My stomach tightened, as it does when you think of your parents stepping outside their prescribed roles, and I folded the paper back into the envelope. Fifteen years ago the same notion must have prompted me to put his letter inside Don Giovanni. For want of a better idea I stuck it back in the score and returned everything to the trunk. I needed to rummage through a different carton to find my own birth certificate, and it was getting too late in the morning for me to indulge in nostalgia.