She had told them she had a doctor’s appointment and needed extra time for lunch. She told him that. As she entered the hotel elevator he could not help but notice her fine hips. Then, incredibly, they were in the room. His heart was uncontrollable and everything was prepared for them, the sleek furnishings, the chairs, the thick fresh towels in the bath. There had been four murders in Brooklyn the night before. The brokers were going wild on Wall Street. On Fourteenth, men stood in the cold beside tables of watches and socks. The madman on Fifty-seventh was singing arias at the top of his voice, buildings were being torn down, new towers rising. She rose to draw the drapes and for a moment stood in the space between them, in the light and looking down. The splendor and newness of her! He had known nothing like it.

Her apartment was borrowed, from someone on assignment. Even at that, it was sparsely furnished. He wanted to give her something every time he saw her, a gift, something unexpected, a chrome and leather chair that he showed her in the window before he ordered it delivered, a ring, a rosewood box, but he was careful to keep nothing that came from her— note, e-mail, photograph—that might betray him. There was one exception, a picture he had taken as she half sat up in bed, from over her bare shoulder, breasts, smooth stomach, thighs, you would not know who it was. He kept it at work between the pages of a book. He liked to turn to it and remember.

In those days of desire so deep that it left him empty-legged, he did not behave unnaturally at home—if anything he was more loving and devoted although Lily, especially, was beyond increased devotion. He came home filled with forbidden happiness, forbidden but unrivalled, and embraced his wife and played with or read to his children. The prohibited feeds the appetite for all the rest. He went from one to the other with a heart that was pure. On Park Avenue he stood on the island in the middle, waiting to cross. The traffic lights were turning red as far as he could see. The distant buildings stood majestic in the monied haze. Beside him were people in coats and hats, with packages, briefcases, none of them as fortunate as he. The city was a paradise. The glory of it was that it sheltered his singular life.

— Am I your mistress? she asked one day.

— Mistress? No, he thought, that was something older, even old-fashioned. He knew of no word to truly describe her other than probable downfall or perhaps fate.

— How was I lucky enough to meet you? he said.

They were having dinner amid the liveliness of the crowd, the intimacy within it, the voices all around. He had seen most of them. She was by far the prize of the room.

— We’re going to be friends for a long time, she promised.

Summer mornings with their first, soft light. Amorous mornings, the red numbers flicking silently on the clock, the first sunlight in the trees. Her stunning naked back. The most sacred hours, he realized, of his life.