"But if he doesn't hear," she persisted, "you will have to go down the river and warn him."

He nodded. And yet his thought went first to the fact that, if he had to do this, if Roshan Khân had to be left in charge of the relief, it would be still more awkward for Vincent Dering.

Tring-a-tring-tring!

The answering tinkle brought a little breath of joy to them both; but Erda felt inclined to stamp her feet at the slow precision with which Lance--who had to remember each equivalent sign--spelt out his message. He could not be quicker, of course, and yet surely he might! She longed to snatch at the handles herself, though she could not signal at all.

"There, that's done!" she cried, as a continuous short rattle followed from the other end, which Lance translated into--"All right, await you." "Now! what is to be done next?"

"Roshan Khân--he'll get the men together," answered Lance, already on his way to the wicket in the gate. To his surprise, it was closed. He knocked, no answer came. Erda, holding the lamp, looked at him startled.

"Sentry!" he called. "Sentry! Open the door! Miracle!'"

It was the password for the night, given by Captain Dering in contemptuous memory of the day; but it produced no result. The wicket remained obstinately closed.

"They've locked us in!" whispered Erda; the lowering of her voice being due to a swift instinct that the less fuss made the better; the less chance of interruption.

Lance bent his ear to the keyhole to listen. Those dull, muffled reverberations--either distant thunder, or faint, ineffective explosions of electricity close at hand--were louder now; but he could hear no sound above them. He shook his head.