“I’m well aware of the time/nitrogen/oxygen ratio,” Paul said. “I’ve been doing math since I was three.” Holding the regulator over his face, he jumped in.

As Paul descended, weightless and with the familiar childlike joy he’d recently discovered in being unfettered by gravity, he was joined by the yacht’s scuba instructor. The water was particularly clear in the Great Barrier Reef, even at eighty feet, and Paul had no trouble finding the wreck. The old ship was fascinating, and as Paul swam in and out of the hull, he was overcome by a feeling of pure happiness. This was why he couldn’t stop diving, he told himself. Then Paul recalled something from the diving manual and tried to remind himself that the giddy feeling could be a sign of impending nitrogen narcosis, but he quickly dismissed it. Surely he had another five or ten minutes. The giddy feeling increased, and when Paul saw the scuba instructor motioning for him to go up, instead of following his instructions, Paul swam away. For the first time in his life, he thought irrationally, he was denying the rigid rules of the monstrous numbers that had dominated his life. He was free.

The scuba instructor swam after him, and what ensued next was an underwater tussle worthy of a James Bond movie. Eventually, the instructor won, twisting himself behind Paul’s back and putting him in a choke hold.

Slowly, they ascended to the surface, but it was too late. An air bubble had formed and lodged itself in Paul’s spine; as he rose, the air bubble expanded rapidly. When Paul reached the surface, it exploded, ripping apart the nerves in his spine.

“Yoo-hoo,” Enid Merle said, shouting up to Annalisa Rice. Annalisa looked over the side of the terrace, where she was overseeing the erec-tion of a large white tent, and spotted Enid waving in excitement. “A reporter at the paper just called me — Sandy Brewer has been convicted.

He’s going to jail.”

“Come upstairs and tell me about it,” Annalisa called to her below.

In a few minutes, Enid arrived on the terrace, panting slightly as she fanned the air in front of her face. “It’s so hot. I can’t believe how hot it is for September. They say it’s going to be ninety degrees on Saturday.

And we’ll probably have a thunderstorm.”

“We’ll be fine,” Annalisa said. “We have the tent and the whole apartment. I’ve cleared out most of Paul’s things from the ballroom, so we’ll have that space as well.”

“How is Paul?” Enid asked, by rote.

“Exactly the same,” Annalisa said. As she always did when she spoke about Paul, she lowered her voice and solemnly shook her head. “I saw him this morning.”

“My dear, I don’t know how you can bear it,” Enid said.

“There’s always the slight chance that he’ll recover. They say miracles do occur.”

“Then he could end up being another Stephen Hawking,” Enid said reassuringly, patting Annalisa on the arm.

“I’ve decided to donate money to the facility for a wing in Paul’s name.

Even if Paul never comes out of the coma, it’s possible, in ten years, someone with similar injuries will.”

“It’s the right thing to do, my dear,” Enid said, nodding approvingly.

“And you still go to see him every day. It’s so admirable.”

“It’s only thirty minutes by helicopter,” Annalisa said, moving into the cool of the apartment. “But tell me all about Sandy.”

“Well,” Enid said, taking a large breath equal to the importance of her news. “He’s been sentenced to five years.”

“That’s terrible.”

“The prosecutor wanted to make an example of him. He’ll serve less time, I’m sure. Maybe two and a half years. Then he’ll get out, and everyone will forget about it. They always do. What I don’t understand is how Sandy Brewer got the cross in the first place.”

“Don’t you know?” Annalisa asked.

“No, my dear. I don’t.”

“Come with me,” Annalisa said. “I have something to show you.”

She led Enid upstairs to the master bedroom. There, on the top of her bureau, was the crude wooden box Mrs. Houghton had left Billy.

“Do you recognize this?” Annalisa asked, opening the lid. She took out the jewelry she’d bought from Mrs. Houghton’s estate and, pointing to the hinge at the back, held out the box to Enid. “It has a false bottom,” she said.

“Oh my goodness,” Enid said, taking the box and examining it. “So that’s where she kept it.” She handed the box back to Annalisa. “That would be very Louise. Hiding it in plain sight. How did you get the box, dear?”

“Schiffer gave it to me. After the King David gala. She was moved by what I said about Billy, and she insisted I take it.”

“But how did she get it?”

Annalisa smiled. “You don’t know that, either? She took it from Billy’s apartment on the day she found him.”

“Clever girl,” Enid said. “I’m so happy she and Philip are marrying at last.”

“Let’s go upstairs,” Annalisa said. “I want you to see the ballroom.”

“Oh my dear, it’s marvelous,” Enid exclaimed, passing through the large double doors. The floor had been restored to its original black-and-white marble checkerboard, the aquarium was gone, and the marble mantelpiece was newly polished, revealing the intricate carvings telling the story of the goddess Athena. Luckily, Paul had never touched the ceiling, so the painting of sky and cherubs still remained. Scattered around the room were little tables and chairs and vases filled with sprays of white lilies and lilacs.

The room smelled heavenly, and strolling to the fireplace, Enid examined the detailed carvings. “Wonderful,” she said, nodding in approval. “You’ve done so much in such a short period of time.”

“I’m very efficient,” Annalisa replied. “And of course, I needed something to keep me busy. After Paul’s accident. It still isn’t appropriate to be seen out in public.”

“Oh no, my dear,” Enid said. “Not for another six months, at least. But a private affair in your own apartment is a different story. And it’s only seventy-five people.”

“I did invite Mindy and James Gooch. And Sam,” Annalisa said. “I’ve decided that Mindy is like one of those old hags in a Grimms’ fairy tale.

If you don’t invite her, she wreaks havoc.”

“How true,” Enid said in agreement. “And it’s always wonderful to have children at a wedding.” She looked around the room with pleasure. “Ah, the times we used to have in this ballroom. When Louise was alive and still young. Everyone wanted to be invited to those parties, and everyone came. From Jackie O to Nureyev. Princess Grace when she was still Grace Kelly. Even Queen Elizabeth came once. She had her own security detail.

Handsome young men in bespoke suits.”

“But now it turns out that Mrs. Houghton was a thief,” Annalisa said, looking directly at Enid. “Or so it seems.”

Enid stumbled a little, and Annalisa took her arm to steady her. “Are you okay?” she asked, leading Enid to a chair.

Enid patted her heart. “Yes, dear. It’s the heat. Old people don’t do well in the heat. That’s why one is always hearing those terrible stories about old people who die in heat waves. Could I have some water, please?”

“Of course,” Annalisa said. She pressed the button for the intercom.

“Gerda? Could you please bring up some ice water for Ms. Merle?”

The water arrived right away, and Enid took a large gulp. “That’s better. Now what were we talking about, dear?”

“The cross. And Mrs. Houghton.”

Enid looked away. “You’re so very much like her, dear. I saw it that night at the gala.”

Annalisa laughed. “Are you saying I’ve got a precious antiquity hidden in the apartment?”

“No, dear,” Enid said. “Mrs. Houghton wasn’t a thief. She was other things, but pilfering antiquities from a museum was not her style.”

Annalisa sat on the small gold ballroom chair next to Enid. “How did she get it, then?”

“You’re awfully curious,” Enid said.

“I’m interested.”

“Some secrets are best left at that — as secrets.”

“Billy Litchfield died because of it.”

“Yes, my dear,” Enid said, patting her hand. “And until just now, when you showed me the box, I never imagined that Billy Litchfield would have been involved in selling the cross. It wasn’t in his character.”

“He was desperate,” Annalisa said. “His building was going co-op, and he didn’t have the money to buy it. He was convinced he would have to leave New York.”

“Ah, New York,” Enid said, taking another sip of water. “New York has always been a difficult place. Ultimately, the city is bigger than all of us.

I’ve lived here for over seventy years, and I’ve seen it happen again and again. The city moves on, but somehow the person does not, and they get run over in the process. That, I’m afraid, is what must have happened to Billy.” Enid leaned back in her chair. “I’m tired, my dear,” she said. “I’m getting old myself.”

“No,” Annalisa said. “It wasn’t New York. Paul was responsible. Sandy Brewer showed him the cross one evening. Paul thought Sandy was going to fire him because he lost twenty-six million dollars on the morning of the Internet Debacle. So Paul sent an e-mail to the Times.”

“Aha,” Enid said. And then, with a wave, as if she wished to sweep it all away, added, “There you go. Everything always works out for the best.”

“Does it?” Annalisa said. “I still need to know how Mrs. Houghton got the cross.” She looked directly into Enid’s eyes, her gaze not wavering.

Louise, Enid remembered, could do that, too — stare a person down until she got exactly what she wanted. “Enid,” she said softly. “You owe me.”

“Do I?” Enid gave a little laugh. “I suppose I do. Otherwise, who knows what would have happened to the apartment? Very well, my dear. If you want the truth so much, you’ll have it. Louise didn’t take the cross from the Met. She took it from my stepmother, Flossie Davis. Flossie took the cross because she was silly and stupid and thought it was pretty. Louise saw her take it and made Flossie give it to her. Louise, I’m sure, intended to return it to the museum, but Flossie had a bit of dirt on Louise. She was quite sure that Louise killed her husband.”