The other end of the passage was reached without a single exit being discovered, and there was no time to run back and try farther in the other direction.

“This is the end, I guess,” said Drake, as the approaching footsteps sounded nearer. “It’s ‘backs against the wall and fight to the death’ for us now, my friend.”

Suiting the action to the word, the little skipper grasped his cudgel by the thinner end, took his revolver—with only one shot remaining—in his other, and flung himself backward against the wall.

Then a curious thing happened. The solid wall at the end of the passage yielded to the pressure of the skipper’s body, and Drake, still leaning against it, fell farther and farther backward, until at last he found himself in a reclining position on the now sloping wall. Then, to Frobisher’s unbounded amazement, the little man disappeared from view, a dull thud from below announcing the fact that he had dropped a distance of several feet. In an instant the younger man realised what had happened. The corridor had a purpose, after all; and the door at the end was probably secured by a concealed spring of some sort which Drake must have unwittingly pressed when he flung himself back against the wall.

Without losing an instant Frobisher knelt down at the edge of the dark opening, then turning, allowed himself to slip downward gradually, for it was obvious that there were no steps; and as his feet touched bottom he was barely in time to remove his fingers from the sill when the door swung to above him with a muffled “click.”

The pirates had not reached the foot of the stairs when the door closed, so that, unless they knew or guessed at and found the secret of opening it, the fugitives were safe from them, at any rate. But the thought occurred to Frobisher when the door closed behind him: now that they were in, how were they to get out again?

He called softly to Drake, and soon found that that worthy was much more startled than hurt, although even yet hardly able to realise what had happened to him. As soon as the little skipper had recovered his faculties a little he listened, and hearing nothing of their pursuers, struck a match, a box of which he had fortunately concealed in his robe, and looked to see whether there was a spring inside the door. He failed to find one, however, and he and Frobisher exchanged glances full of apprehension. They seemed to have escaped a swift death for one of lingering starvation.

But they had no time to spend in dismal forebodings. They could now faintly hear the uproar above them in the passage as the pirates hunted for the door by which their quarry had escaped, and crouched down together, wondering whether their pursuers would hit upon the spring. Minute after minute passed, however, and the door still remained closed; and after about a quarter of an hour the pirates were heard to take their departure, probably convinced that the fugitives had not gone down the stairs, after all.

With a sigh of relief Frobisher turned to Drake and asked him to strike another light, so that they might get some sort of notion where they were. Drake did so; and the first thing the light revealed was a great bundle of torches, evidently placed there in the bygone days for the use of people whose business took them into this underground chamber. The two men eagerly lighted one each, and then, taking a few more as a stand-by, proceeded to explore.

The enormous chamber which the light revealed appeared to contain nothing whatever; but there were several passages leading from it—seven in all, as the explorers counted—and they tried the first they came to, to ascertain where it led.