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“The Milton is interesting too. Thales of Miletus, the sixth and seventh centuries B.C., was the chief of the seven ‘wise men’ of ancient Greece. He preceded Euclid by three centuries. He founded the geometry of lines. He made the first prediction of an eclipse of the sun, to the day. His was the first great name in the history of mathematics. Thales of Miletus.”

“I’ll be damned.” I sat and looked at it for a full minute. “I will be damned. He had a hell of a nerve. Ballou went to college. He might have liked mathematics. He might have known all about Thales of Miletus.”

“But did he know that Miss Kerr’s brother-in-law is a teacher of mathematics?”

“Probably not. Who would ever expect a goddam blackmailer to have a sense of humor? Did you tell Ballou?”

“No. It can wait. I would like some beer.”

“And I would like some milk.” I rose. “This is more like it, something to chew on.” I went to the kitchen. Fritz was below in his room, and I didn’t need any help. As I poured the milk and put the beer and glass on the tray, and took them to the office, my mind was on the newer and hotter riddle, going back to Monday afternoon and remembering how Barry Fleming had looked and acted and what he had said. After a couple of sips of milk, recollecting that we had a guest, I went to the front room to ask if he would like a drink. He was stretched out on the sofa with his arm curled over his eyes. He didn’t want anything. In the short time I was gone Wolfe had been to the shelves and got a book, a volume of the Britannica, and had it open. As I picked up my glass he said, “Thales perfected the theory of the scalene triangle and the theory of lines. He discovered the theorem that the sides of equiangular triangles are proportional. He discovered that when two straight lines intersect the vertically opposite angles are equal, and that the circle is bisected by its diameter.”

I said, “Golly.”

It was close to eleven o’clock when Fred arrived. I took him to the kitchen, because Wolfe was still consulting the encyclopedia, though he must have finished with Thales long ago. When Saul came, I sent him to join Fred in the kitchen and told Wolfe to let us know when he was ready for company, and he glared at me because he was in the middle of an interesting article. The way I know it was interesting is that there isn’t a single page in the whole twenty-four volumes that he wouldn’t think was interesting. I went to the kitchen and brought them, and Saul took the red leather chair and Fred one of the yellow ones.

That was the shortest session with the help on record. “I apologize,” Wolfe said, “for getting you out so late on a winter night, but I need you. There has been a development. The man who maintained that apartment for Miss Kerr — call him X — is in the front room. He came to tell me something that he should have told me two days ago. Last September a man telephoned him and demanded money. The man knew of his visits to that apartment and threatened to make them impossible unless the money was paid, a thousand dollars at once and a thousand dollars a month, in cash, to be mailed to him at general delivery — an assumed name, of course. The money has been paid, a total of five thousand dollars. X is convinced, for reasons he considers valid, that the blackmailer is Orrie Cather. Sunday evening I asked your opinion as to whether Orrie had killed Miss Kerr. I now ask your opinion as to whether he is a blackmailer. Did he blackmail X? Fred?”

Fred was frowning, concentrating. “Just like you said?” he asked. “Just straight open-and-shut blackmail?”

“Yes.”

Fred shook his head. “No, sir. Impossible.”

“Saul?”

“To be sure I have it right,” Saul said, “this was at the time when Orrie was seeing her himself?”

“Yes.”

“Then no. As Fred said, impossible. That would take a real snake.”

“Satisfactory,” Wolfe said. “Archie and I had made our conclusion, and I know, barely short of certainty, who the blackmailer is, but I wanted your opinions. I didn’t get you here just for that; there will be instructions for tomorrow. Archie, may they wait in your room?”

Not the kitchen. He was taking no chances. What if a man-eating tiger bounded in through the kitchen window and they scooted down the hall and saw Ballou? I told them they were welcome to my room as long as they didn’t rummage, and they headed for the stairs. Wolfe gave them a full minute to get up the two flights and then told me to bring Ballou. He was still on the sofa, but when I entered he sat up and started talking. I told him to save it for Wolfe, and he got to his feet and came. I swear his first glance, as he crossed to the red leather chair, was at the package on Wolfe’s desk. A habit is a habit, even when you’re up a tree.

As he sat, he spoke. “I’ve been going over it. I have answered your questions, and I have made you a liberal offer, more than liberal. Either you accept it or you don’t. The other day you told me Cather wasn’t a murderer. Don’t try to tell me now that he’s not a blackmailer.”

“You anticipate me,” Wolfe said. “Mr. Cather is not a blackmailer.”

Ballou stared. “You actually — after what I...” He rose and picked up the package. “By God, you are committed.”

“I am indeed. I can name the blackmailer. Sit down.”

“I have already named him.”

“No. You know only his noms de guerre, Robert Service Kipling and Milton Thales. His real name is Barry Fleming. The husband of Miss Kerr’s sister.”

“That’s absurd. You didn’t even know I had been blackmailed until an hour ago.”

Wolfe would have had to slant his head back to focus on his face, and he doesn’t like to, so he wasn’t focusing at all. “For a man of affairs,” he said, “you’re remarkably obtuse. You’re in a pickle, and I am your only hope. You must have help, and you can’t go to a lawyer, or to anyone, without disclosing your connection with Miss Kerr and a murder. But you talk and act as if you were in control. You spring to your feet and grab that package of money. Pfui. You probably have no further information for me. Either sit down and listen, or go.”

You have to hand it to the president of the Federal Holding Corporation. He had pride and he had grit. If he had put the package back on Wolfe’s desk he would have been buckling under, so he didn’t. He put it on the little stand by the red leather chair, and there it was at his elbow when he sat, under his control.

“I’m listening,” he said.

“That’s better,” Wolfe said. “First, Mr. Cather. Knowledge of a man cannot alone exclude him as a murderer, but it can as a blackmailer. Murder can be merely a spasm, but not blackmail. Four of us who have known Mr. Cather well for years — the two men I sent for, and Mr. Goodwin and I — agree that it can’t possibly be Mr. Cather who blackmailed you. Now, the blackmailer. That name, Milton Thales — pronouncing it as you did and as almost any American would. But if I pronounce it Thā-lēz does it stir your memory?”

“Should it?”

“Yes.”

He was frowning. “Thā-lēz — why, yes. An early Greek... eclipse of the sun... geometry...”

Wolfe nodded. “That’s enough. A renowned name in the history of mathematics. Thā-lēz of Miletus. Milton Thales. Barry Fleming, Miss Kerr’s brother-in-law, teaches mathematics at a high school. Miss Kerr told her sister your name, and she told her husband. So I have named the blackmailer.”

“Thā-lēz,” Ballou said. “Thales. Miletus. Milton. By God, I believe you have. And Isabel — Miss Kerr told me she had told my name to no one. She lied. I wonder how many more.”

“Probably none. Those two were special to her. I think we may assume that only five people know of your connection with Miss Kern Mr. Cather, Mr. and Mrs. Fleming, Mr. Goodwin, and I. And only three know you were blackmailed, besides the blackmailer: Mr. Goodwin, you, and I. The two men upstairs, out of hearing, know of the blackmail, but not of you. I call your attention to a detail. My objective is to get Mr. Cather released and not charged with homicide. It’s likely that I could achieve it simply by telling the police about Mr. Fleming blackmailing you. At least that would divert them, but I don’t intend or desire to do it. I owe you some consideration, since I learned of the blackmailing only through you. I’m obliged to you.”