“The chirurgical evidence of the blood, and the thaumaturgical evidence of the time of psychic shock demonstrate that clearly.

“But you have yet to explain how he was stabbed inside a locked room at nine o’clock — or at any other time. The evidence shows that there was no one else in that room when he was stabbed. What is your explanation for that?”

“I hate to say it,” said Lord Bontriomphe, “but it appears to me that Master Sean’s testimony is faulty. With another master sorcerer at work here, the evidence could have been fudged. Here’s what happened: Master Ewen, knowing that he had to get rid of the Damoselle Tia, decided to use her to get rid of Master Sir James at the same time. He put her under a spell. She talked her way into Master Sir James’ room, used his own knife on him when he least suspected it, and walked out, leaving that half-moon heel print near the door.”

Lord Bontriomphe leaned back in his chair. “As a matter of cold fact, if it were not for that heel print, I would say that Master Ewen put Master Sir James under a spell which forced him to stab himself with that contact cutter.

“Naturally, he would fumble the job. Even under the most powerful magic spell it is difficult to force anyone to commit suicide.”

He glanced at Lord Darcy. “As you yourself noticed with the Damoselle Tia, my lord; although she was induced to jump off the bridge, she nevertheless fought to keep herself afloat after she struck the water.”

“Yes, she did,” Lord Darcy agreed. “Go on.”

“As I said,” Lord Bontriomphe continued, “if it weren’t for that heel print, I would say that Sir James was forced to suicide by Black Magic.” He shrugged. “That still may be possible, but I’d like to account for that heel print. So, I say that the Damoselle Tia stabbed him and walked out, and that Master Ewen used sorcery to relock the door from the room above. I don’t say that she is technically guilty of murder, but certainly she was a tool in Master Ewen’s hands.”

The Marquis of London snorted loudly and opened his mouth to say something, but Lord Darcy held up a warning hand. “Please, my lord cousin,” he said mildly. “I think it incumbent upon us to listen to the rest of Lord Bontriomphe’s theories. Pray continue, my lord,” he said, addressing the London investigator.

Lord Bontriomphe looked at him bitterly. “All right; so you two geniuses have worked everything out. I am just a legman; I’ve never claimed to be anything else. But — if you don’t like those theories, here’s another.”

He took a deep breath and went on. “We arrested Master Sean in the first place on the rather flimsy evidence that he and Sir James had both worked out a way to manipulate a knife by thaumaturgical means. Now suppose that was done? Suppose that is the way Sir James was killed? Who could have done it?” He spread a hand.

“I won’t say Sir James did — although he could have. But, to assume that he took such a roundabout way of committing suicide would be, in the words of my lord the Marquis, fatuous. To think that it happened by accident would be even more fatuous.

“Or my lord may think of another adjective; I won’t quibble.

“We know that Master Sean did not do it, because it would have taken at least three quarters of an hour to prepare the spell, and, according to Grand Master Sir Lyon, there could not be more than one wall, or other material barrier, between the sorcerer and his victim — and certainly Master Sean could not have stood out in that hall, going through an intricate spell like that for half an hour or more, without being noticed. Besides, he wasn’t even in that hall at that time.” He waved a hand. “Forget Master Sean.”

“Good of you,” murmured Lord Darcy.

“Who is left? Nobody that we know of. But couldn’t Master Ewen have figured out the process? After all, if two Master magicians can figure it out separately, why not a third? Or maybe he stole it; I don’t know. But isn’t it possible that Master Ewen forced the weapon into Master Sir James’ chest?”

Lord Darcy started to say something, but this time it was the Marquis of London who interrupted.

“Great God!” he rumbled. “And it was I who trained this man!” He swiveled his massive head and looked at Lord Bontriomphe. “And pray, would you explain what happened to the weapon? Where did it disappear to?”

Lord Bontriomphe blinked, said nothing, and turned his eyes to Lord Darcy.

“Surely you see,” said Lord Darcy calmly, “that the contact cutter which lay beside Sir James’ body — and which, by the by, was the only edged weapon in the room — could not possibly have been the murder weapon. You did read the autopsy report, did you not?”

“Why, yes, but—”

“Then surely you see that a blade in the shape of an isosceles triangle — two inches wide at the base, and five inches long — could not have made a stab wound five inches deep if the cut it made was less than an inch wide.

“Even more important — as I pointed out to Master Sean earlier today — a knife of pure silver, while harder than pure gold, is softer than pure lead. Its edges would certainly have been noticeably blunted if it had cut into two ribs. And yet, the knife retained its razor edge.

“It follows that Master Sir James was not killed by his own contact cutter — further, that the weapon which killed him was not in the room in which he died.”

Lord Bontriomphe stared at Lord Darcy for a long second, then he turned and looked at the Marquis of London. “All right. As I said, I didn’t like those hypotheses, because they don’t explain away the heel print — and now they don’t explain the missing knife. So I’ll stick to my original theory, with one small change: Tia brought her own knife and took it away with her.”

The Marquis of London did not even bother to look up from his desk. “Most unsatisfactory, my lord,” he said, “most unsatisfactory.” Then he glanced at Lord Bontriomphe. “And you intend to put the blame on the Damoselle Tia? Hah! Upon what evidence?”

“Why — upon the evidence of her heel print.” Lord Bontriomphe leaned forward. “It was Master Sir James’ blood, wasn’t it? And how could she have got it on her heel except after Master Sir James bled all over the middle of the floor?”

The Marquis of London looked up toward the ceiling. “Were I a lesser man,” he said ponderously, “this would be more than I could bear. Your deductions would be perfectly correct, Bontriomphe — if that were the Damoselle Tia’s heel print. But, of course, it was not.”

“Whose else could it have been?” Bontriomphe snapped. “Who else could have made a half-moon print in blood like that?”

My lord the Marquis closed his eyes and, obviously addressing Lord Darcy, said: “I intend to discuss this no further. I shall be perfectly happy to preside over this evening’s discussion — especially since we have obtained official permission for it. I shall return when our guests arrive.” He rose and headed toward the rear door, then he stopped and turned. “In the meantime, would you be so good as to dispel Lord Bontriomphe’s fantasy about the Damoselle Tia’s heel print?” And then he was gone.

Lord Bontriomphe took a deep breath and held it. It seemed a good three minutes before he let it out again — slowly.

“All right,” he said at last, “I told you I wasn’t the genius around here. Obviously you have observed a great deal more in this case than I have. We’ll do as my lord of London has agreed. We’ll get them all up here and talk to them.”

Then, abruptly, he slammed the flat of his hand down upon the top of his desk. “But — by Heaven, there’s one thing I want to know before we go on with this! Why do you say that that heel print did not belong to Damoselle Tia?”

“Because, my dear Bontriomphe,” said Lord Darcy carefully, “it was not a heel print.” He paused.

“If it had been, the weight of the person wearing the heel would have pressed the blood down into the fiber of the rug; and yet — you will agree that it did not? That the blood touched only the top of the fibers, and soaked only a little way down?”