Lars Davidsen’s filing system was an elaborate code of letters, numbers, and colors devised to allow for a descending hierarchy within a single category. Initial notes were subordinate to first drafts, first drafts to final drafts, and so on. It wasn’t only his years of teaching and writing that were in those drawers, but every article he had written, every lecture he had given, the voluminous notes he had taken, and the letters he had received from colleagues and friends over the course of more than sixty years. My father had catalogued every tool that had ever hung in the garage, every receipt for the six used cars he had owned in his lifetime, every lawnmower, and every home appliance—the extensive documentation of a long and exceptionally frugal history. We discovered a list for itemized storage in the attic: children’s skates, baby clothes, knitting materials. In a small box, I found a bunch of keys. Attached to them was a label on which my father had written in his small neat hand: “Unknown Keys.”

We spent days in that room with large black garbage bags, dumping hundreds of Christmas cards, grade books, and innumerable inventories of things that no longer existed. My niece and mother mostly avoided the room. Wired to a Walkman, Sonia ambled through the house, read Wallace Stevens, and slept in the comatose slumber that comes so easily to adolescents. From time to time she would come in to us and pat her mother on the shoulder or wrap her long thin arms around Inga’s shoulders to show silent support before she floated into another room. I had been worried about Sonia ever since her father died five years earlier. I remembered her standing in the hallway outside his hospital room, her face strangely impassive, her body stiffened against the wall, and her skin so white it made me think of bones. I know that Inga tried to hide her grief from Sonia, that when her daughter was at school my sister would turn on music, lie down on the floor, and wail, but I had never seen Sonia give in to sobs, and neither had her mother. Three years later, on the morning of September 11, 2001, Inga and Sonia had found themselves running north with hundreds of other people as they fled Stuyvesant High School, where Sonia was a student. They were just blocks from the burning towers, and it was only later that I discovered what Sonia had seen from her schoolroom window. From my house in Brooklyn that morning, I saw only smoke.