“Edgar sleeps in the next set of rooms.” He pointed to my left. “I suppose it makes them believe that I feel more under their watchful eye, but that is clearly not the case. Hammond sleeps in the large bedroom on the third floor. Climb the stairs and turn right. That door will lead to a sitting room, and the door beyond that is to his bedroom. During the day, Hammond keeps the octavo in his waistcoat pocket. I do not know where he keeps it at night.”

“That shan’t concern me,” I said. “He will know, and that will be enough. Do you believe you can make your way from this house silently?”

“Yes,” he said, but there was something in his voice, some hesitation.

“You fear I might fail,” I said. “You fear that they will best me and then, if you are gone, they will take out their revenge upon your daughter.”

He nodded.

“Then stay here,” I said. “You may as well hear what transpires. I only ask that you remain hidden until I come to get you. I can well understand your desire to protect your daughter, and I am confident you can understand my desire to protect you.”

He nodded once more.

I shook his hand, this man who had stood with me in the way I had always wished my own father would have but never did. He stood by my family when my uncle died, when I lost the man who had become more like a father than any I had known. He was no warrior, and perhaps even wanting in the area of bravery, but I respected him no less for it. He was the man he was, not built for such struggles as had been visited upon him, and he dealt with them with fortitude. He fretted not about his own difficulties but worried only for his daughter. He expended far more energy in the preservation of my feelings than his own. How could I not respect him?

We embraced, and I left his rooms, determined to finish my business in this house forever.

WITH MR. FRANCO SECURED, I moved on to Edgar’s room. I opened the door very slowly and moved through his sitting room. The space was neat and spare, hardly lived in at all. At the next door I turned the handle with excruciating slowness and proceeded into the dark.

As with his sitting room, the bedroom was spare and largely unused. I stepped forward toward the bed, prepared to grab Edgar in much the same way I had grabbed Mr. Franco, though with less gentleness. But I did not grab him, for there was no one to grab. The bed was unmade but empty, and that could mean but one thing: Edgar knew I was in the house.

I turned to rush back to Franco’s room. Despite his concerns for his daughter, I saw now that my main task was to get him out of the house unharmed. There would be no time for these French agents to pursue petty revenge. They would be captured or fleeing. Gabriella could come to no harm.

When I turned, however, I found myself facing a dark figure I recognized at once as Edgar. He stood with his legs planted firmly apart, one hand raised with a pistol, the other holding a dagger of some sort.

“You idiot Jew,” he said. “I heard you come blundering in. A bear could have made less noise.”

“A large bear or a small bear?” I asked.

“Do you think to quip your way out of this predicament?”

I shrugged. “It had occurred to me to attempt to do so.”

“That has ever been your problem,” he said. “You have been so impressed with your own cleverness, you refuse to believe anyone might be clever but yourself. Now, tell me why you’ve come here. Did you come for the plans?”

“I came for you,” I said. “After visiting Mother Clap’s house, I realized that certain inclinations I possessed could no longer be denied.”

“You cannot hope to confuse me with your nonsense. I know you are here for the engine plans. You think I care for Franco? He may hide or escape as he wishes, though he should be far better off if he escapes. The question is, who sent you? How much do the British agents know? Has Cobb been taken, or did he escape? You can either tell me now, or I’ll take you upstairs. Once we awaken Hammond, he will not hesitate to make you tell him precisely what he wishes to know.”

I could not speak as to Mr. Hammond’s ability to extract information. I could, however, rejoice that Edgar had just now told me precisely what I wished to know: Hammond was still asleep.

“Has anyone ever observed,” I asked, “that you look remarkably like a duck? The truth of the matter is, I have always been kindly disposed toward ducks. When I was a boy, a good-hearted relative brought me one as a present. And now, years later, I meet you, the very image of that duck, and I cannot help but think that we ought to be friends. Come, let us set down our weapons and go find ourselves a pond where I may eat bread and cheese by the shore and you may paddle upon the waters. I shall be happy to toss you bits of crust.”

“Shut your foul mouth,” he snapped. “ Hammond will be able to question you just as effectively if you have a lead ball in your leg.”

I did not doubt it. “One moment. There are three facts about the life of the duck that I consider to be of great importance to the matters at hand. First, the female duck makes for a particularly tender and caring parent. Second,” I began, but the truth was I did not have a second point. One point sufficed, for I deployed the advice of Mr. Blackburn, who had instructed me upon the rhetorical device of the series. Having informed Edgar that there would be three points, I knew he would remain in expectation of the remaining items. Thus I had the opportunity to surprise him with something else.

In this case, I surprised Edgar the servant and French spy with a powerful blow to his stomach. In my fanciful thoughts, a blow to the nose or mouth, one likely to produce blood and flying teeth, would have been more satisfying, but a blow to the stomach produces the reflex of doubling over. And that meant that even if he managed to fire his pistol, he would be firing down rather than forward.

As it happened, he did not fire, and though he did not let the pistol fall from his grasp, I had it out of his hand before he had even reached the ground. I slipped it into my pocket and, just as Edgar began to push himself upward, I leveled a kick, this time to his ribs. He slid a few inches along the floor and dropped his dagger, which I collected and quickly used to cut several lengths of rope from his bed canopy. These were used, as my practical-minded reader might guess, to bind Edgar’s feet and hands. During this process I leveled a few more blows to his abdomen, not out of cruelty or malice, but because I wished to keep him unable to call out until I was able to gag him.

At last I cut a swath of cloth, which I used to do just that. When he was fully incapacitated, I stood up and towered over him. “The ironic thing,” I said, “was that you originally observed that I would not be able to quip my way out of my predicament. Now, as for your fate, I see no need to do much at all with you. You perhaps wonder if I will inform the King’s Messengers that you are here. The answer is, I shall not. Crooked Luke and the rest of the boys will be having their way with this house at some point tomorrow, and I shall leave them to deal with you.”

Edgar grunted and struggled against his bonds, but I affected no interest as I left him.

ONE FLOOR UP and into the bedroom. Events went quickly and smoothly. As promised, Hammond was asleep, and it took no great effort to overpower him. I held his chin in one hand and pressed the tip of Edgar’s blade into his chest with the other. It was deep enough to draw blood and to hurt, quite badly from the look upon Hammond ’s face, but no more than that.

“Give me the plans,” I said.

“Never.” His voice remained calm and even.

I shook my head. “ Hammond, you chose to employ me. You knew who I was when you brought me into your scheme. That means you know what I am willing to do. I will cut off fingers, gouge out eyes, extract teeth. I don’t believe you are made of stuff to endure these torments. I shall count to five, and then we will find out.”