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: