UPON the following day we were afoot again, and shortly at handgrips with the enemy. In retrospect, that restless time offers a chaotic prospect, with no peaceful spot amid its turmoils.  
All that was reposeful in nature seemed to have become an irony and a mockery to us—who knew how an evil demigod had his sacrificial altars amid our sweetest groves. This idea ruled strongly in my mind upon that soft autumnal day.
 
"The net is closing in," said Nayland Smith.
 
"Let us hope upon a big catch," I replied, with a laugh.
 
Beyond where the Thames tided slumberously seaward showed the roofs of Royal Windsor, the castle towers showing through the autumn haze. The peace of beautiful Thames-side was about us.
 
This was one of the few tangible clews upon which thus far we had chanced; but at last it seemed indeed that we were narrowing the resources of that enemy of the white race who was writing his name over England in characters of blood. To capture Dr. Fu-Manchu we did not hope; but at least there was every promise of destroying one of the enemy's strongholds.
 
We had circled upon the map a tract of country cut by the Thames, with Windsor for its center. Within that circle was the house from which miraculously we had escaped—a house used by the most highly organized group in the history of criminology. So much we knew. Even if we found the house, and this was likely enough, to find it vacated by Fu-Manchu and his mysterious servants we were prepared. But it would be a base destroyed.
 
We were working upon a methodical plan, and although our cooperators were invisible, these numbered no fewer than twelve—all of them experienced men. Thus far we had drawn blank, but the place for which Smith and I were making now came clearly into view: an old mansion situated in extensive walled grounds. Leaving the river behind us, we turned sharply to the right along a lane flanked by a high wall. On an open patch of ground, as we passed, I noted a gypsy caravan. An old woman was seated on the steps, her wrinkled face bent, her chin resting in the palm of her hand.
 
I scarcely glanced at her, but pressed on, nor did I notice that my friend no longer was beside me. I was all anxiety to come to some point from whence I might obtain a view of the house; all anxiety to know if this was the abode of our mysterious enemy—the place where he worked amid his weird company, where he bred his deadly scorpions and his bacilli, reared his poisonous fungi, from whence he dispatched his murder ministers. Above all, perhaps, I wondered if this would prove to be the hiding-place of the beautiful slave girl who was such a potent factor in the Doctor's plans, but a two-edged sword which yet we hoped to turn upon Fu-Manchu. Even in the hands of a master, a woman's beauty is a dangerous weapon.
 
A cry rang out behind me. I turned quickly. And a singular sight met my gaze.
 
Nayland Smith was engaged in a furious struggle with the old gypsy woman! His long arms clasped about her, he was roughly dragging her out into the roadway, she fighting like a wild thing—silently, fiercely.
 
Smith often surprised me, but at that sight, frankly, I thought that he was become bereft of reason. I ran back; and I had almost reached the scene of this incredible contest, and Smith now was evidently hard put to it to hold his own when a man, swarthy, with big rings in his ears, leaped from the caravan.
 
One quick glance he threw in our direction, and made off towards the river.
 
Smith twisted round upon me, never releasing his hold of the woman.
 
"After him, Petrie!" he cried. "After him. Don't let him escape. It's a dacoit!"
 
My brain in a confused whirl; my mind yet disposed to a belief that my friend had lost his senses, the word "dacoit" was sufficient.
 
I started down the road after the fleetly running man. Never once did he glance behind him, so that he evidently had occasion to fear pursuit. The dusty road rang beneath my flying footsteps. That sense of fantasy, which claimed me often enough in those days of our struggle with the titanic genius whose victory meant the victory of the yellow races over the white, now had me fast in its grip again. I was an actor in one of those dream-scenes of the grim Fu-Manchu drama.
 
Out over the grass and down to the river's brink ran the gypsy who was no gypsy, but one of that far more sinister brotherhood, the dacoits. I was close upon his heels. But I was not prepared for him to leap in among the rushes at the margin of the stream; and seeing him do this I pulled up quickly. Straight into the water he plunged; and I saw that he held some object in his hand. He waded out; he dived; and as I gained the bank and looked to right and left he had vanished completely. Only ever-widening rings showed where he had been. I had him.
 
For directly he rose to the surface he would be visible from either bank, and with the police whistle which I carried I could, if necessary, summon one of the men in hiding across the stream. I waited. A wild-fowl floated serenely past, untroubled by this strange invasion of his precincts. A full minute I waited. From the lane behind me came Smith's voice:
 
"Don't let him escape, Petrie!"
 
Never lifting my eyes from the water, I waved my hand reassuringly. But still the dacoit did not rise. I searched the surface in all directions as far as my eyes could reach; but no swimmer showed above it. Then it was that I concluded he had dived too deeply, become entangled in the weeds and was drowned. With a final glance to right and left and some feeling of awe at this sudden tragedy—this grim going out of a life at glorious noonday—I turned away. Smith had the woman securely; but I had not taken five steps towards him when a faint splash behind warned me. Instinctively I ducked. From whence that saving instinct arose I cannot surmise, but to it I owed my life. For as I rapidly lowered my head, something hummed past me, something that flew out over the grass bank, and fell with a jangle upon the dusty roadside. A knife!
 
I turned and bounded back to the river's brink. I heard a faint cry behind me, which could only have come from the gypsy woman. Nothing disturbed the calm surface of the water. The reach was lonely of rowers. Out by the farther bank a girl was poling a punt along, and her white-clad figure was the only living thing that moved upon the river within the range of the most expert knife-thrower.
 
To say that I was nonplused is to say less than the truth; I was amazed. That it was the dacoit who had shown me this murderous attention I could not doubt. But where in Heaven's name WAS he? He could not humanly have remained below water for so long; yet he certainly was not above, was not upon the surface, concealed amongst the reeds, nor hidden upon the bank.
 
There, in the bright sunshine, a consciousness of the eerie possessed me. It was with an uncomfortable feeling that my phantom foe might be aiming a second knife at my back that I turned away and hastened towards Smith. My fearful expectations were not realized, and I picked up the little weapon which had so narrowly missed me, and with it in my hand rejoined my friend.
 
He was standing with one arm closely clasped about the apparently exhausted woman, and her dark eyes were fixed upon him with an extraordinary expression.
 
"What does it mean, Smith?" I began.
 
But he interrupted me.
 
"Where is the dacoit?" he demanded rapidly.
 
"Since he seemingly possesses the attributes of a fish," I replied, "I cannot pretend to say."
 
The gypsy woman lifted her eyes to mine and laughed. Her laughter was musical, not that of such an old hag as Smith held captive; it was familiar, too.
 
I started and looked closely into the wizened face.
 
"He's tricked you," said Smith, an angry note in his voice. "What is that you have in your hand?"
 
I showed him the knife, and told him how it had come into my possession.
 
"I know," he rapped. "I saw it. He was in the water not three yards from where you stood. You must have seen him. Was there nothing visible?"
 
"Nothing."
 
The woman laughed again, and again I wondered.
 
"A wild-fowl," I added; "nothing else."
 
"A wild-fowl," snapped Smith. "If you will consult your recollections of the habits of wild-fowl you will see that this particular specimen was a RARA AVIS. It's an old trick, Petrie, but a good one, for it is used in decoying. A dacoit's head was concealed in that wild-fowl! It's useless. He has certainly made good his escape by now."
 
"Smith," I said, somewhat crestfallen, "why are you detaining this gypsy woman?"
 
"Gypsy woman!" he laughed, hugging her tightly as she made an impatient movement. "Use your eyes, old man."
 
He jerked the frowsy wig from her head, and beneath was a cloud of disordered hair that shimmered in the sunlight.
 
"A wet sponge will do the rest,&............