When Jonathan Gaynor opened the door, Mallory was close enough to notice the light sprinkle of freckles across his nose. He was only a few years shy of forty, yet the idea of a small boy with a fake beard persisted. She held up a leather folder with her shield and photo ID. He actually read the card. Most people barely glanced at it.

"Sergeant Mallory, you're right on time." He opened the door wide and stepped back as she walked in. He looked at his Rolex. "And I mean right on time, exact quartz time."

She watched his eyes drop to inspect the cashmere blazer she wore over her jeans, probably trying to reconcile the good cloth with the badge-and-gun salary. In the manner of an insurance-appraiser, she noted the recent water rings on the antique woods, and a newspaper opened on light brocade upholstery which was probably now smudged with print. Delicate pieces of collector's crystal sat on every surface – nearly every surface. Her eye for symmetry filled in the gaps on the tables where other pieces had been until recently. She sat down in the large armchair which dominated the rest of the furniture. And it was she who motioned him to sit down in the opposite smaller chair.

"You didn't mention this appointment to anyone?"

"Of course not, Sergeant." He folded his body into the chair, and his arms jutted out at risky angles to the figurines on the near tables. "I can appreciate the fact that undercover work is dangerous. You can rely on my discretion."

"Thank you. One of your neighbors believes I'm a private detective. I'd like her to go on believing that."

"Of course. How can I help you?"

"You knew Inspector Markowitz?"

"We met once. He came by after my aunt was murdered. I liked the man. I was sorry to hear about his death." One hand moved of its own accord and fell over the arm of his chair. The other hand rested on his thigh, though these two body parts seemed unacquainted. No interaction of his limbs ever implied that they had met before.

"Sergeant Riker tells me Markowitz asked for your expertise, Mr Gaynor."

"Yes. He was interested in the social dynamics of Gramercy Park, particularly the elderly inhabitants."

"There are no notes on that meeting. It might help us to follow his line of investigation if you could remember what was said."

"Well, that was over two months ago. I only recall the gist of it. He focussed on all the ways elderly women connected with one another in Gramercy. This square is an interesting little nation unto itself." The hand which had been dangling now joined the rest of him, rising to the arm of the chair, knocking into the small table on its way. Gaynor never seemed to notice the hand had injured itself, he and the hand were that far removed from one another.

"Was Markowitz interested in anything more specific?"

"Yes, but I could only give him a general picture. I'm afraid I wasn't much help on particulars. You see, I hadn't moved in yet, not until weeks after my aunt's death. So, at the time, I was out of touch with the square."

"Sergeant Riker seemed to think Markowitz got a great deal of help from you. The interview lasted what – three hours? His usual style was forty minutes at the outside. I call that interesting."

Gaynor appeared to be searching the ceiling for personal notes on the subject.

"He was looking for commonalities. The only common factor I could pin down for him was the isolation of the elderly. Now there had only been two murders at that time. I remember asking if the other woman, Mrs Cathery, had any social network. He said no, none that they could discover. Well, neither did Aunt Estelle, and neither of them had live-in help." One hand stumbled off the arm of the chair and landed as a dead weight on top of the other one in his lap.

"But Mrs Cathery didn't live alone. There was a grandson living in the apartment. Henry Cathery. Do you know him?"

"This is New York City. The good-neighbor thing doesn't extend to the next apartment, let alone a building at the end of the block. My aunt knew him. She said he was a recluse. And I know he's eccentric." One foot walked under the coffee table and the accompanying shin made a thud against the hard edge. The pain was not relayed back to Gaynor who never even winced. "According to the newspapers, he didn't even notify the police that his grandmother never came home that night. Didn't you find that odd? I mean, from the police point of view?"

"Odd? Well, he told the investigating officer he was only grateful for the peace and quiet, so it never occurred to him to go looking for her."

That initial interview with Henry Cathery had been conducted three months ago while the first kill still belonged to Homicide and not Special Crimes. The investigating officer's notes and a follow-up interview had decided Markowitz that Cathery had been truthful in this. Markowitz had always been charmed by blatant honesty.

"Mr Gaynor, you've never spoken to Henry Cathery?"

"Call me Jonathan," he said, sitting back in the chair, his elbow nudging a figurine to the edge of the table on his left. "I used to see him in the park now and then. I nodded to him a few times the first week I was here. He never nodded back – just looked right through me. He's a constant fixture in the park, but I don't spend much time there anymore."

He stood up and followed his legs to the wide picture window at the far wall. He motioned her over. "There he is," he said, pointing down to the bench behind the black bars and directly across the street from the building. Henry Cathery's head was bowed over a portable chessboard as she drew closer to the window and looked down on him. Cathery chose that moment to lift his head, and she could have sworn he was looking directly at her. A reflexive instinct pulled her one step back from the window. She continued to stare down at Cathery with equal parts of revulsion and fascination.

"Bit late for him to be out," Gaynor was saying. "He's usually there during the day. See the game board on his lap? He was some sort of chess champion as a child, I think. Burned out rather early. Forgive me, I'm probably telling you things you already know."

When they turned away from the window, it was he who guided her toward the couch. "I believe your first name is Kathleen?"

She nodded. "Did you know Pearl Whitman?"

"Never met her. May I call you Kathy?"

"No."

His face reddened. Good. "Pearl Whitman visited spiritualists on a regular basis. She might be connected to a medium who comes here every – '

"Redwing?"

"You know her?"

"Who could miss a spectacle like that? How tall is she? Six-two? And the girth." His hands made a wide circle, knocking into a slender porcelain figurine on a long table behind the couch and setting it to rocking slightly. "I passed her in the lobby of this building one day as I was leaving. The doorman told me her name. I asked my aunt about her the next time I came by. This was a very long time ago, but I remember the conversation very well. It ended in a very loud argument."

"Did your aunt attend the seances?"

"She never said. Of course she wouldn't have after that. So you think Redwing's involved in this?"

"I'm interested in everything that goes on in the square. Redwing's been coming here every week for more than a year. When you argued with your aunt, what did you have against the medium?"

His hand suddenly left him to wave in the air, and a scatter pillow sailed to the marble floor. "Well, it's a bag of tricks, isn't it? It probably wouldn't take anything very sophisticated to fool a pack of old women who really want to believe in that nonsense. It's a nasty business, victimizing the elderly. I really detest people like that."