The only one not in the secret was the Canuk, Miles. One night recently he had not been in the compound, and, putting two and two together, Captain Blair had concluded that the fellow was in touch with one section of the pirate crew. On that occasion the prisoners had been numbered off both in leaving and returning to the compound, and although one was missing, the fact did not appear to trouble the custodians of the gate. When Captain Blair taxed the delinquent, and demanded an explanation, Miles pitched in a plausible yarn to the effect that he had been working down below on board the Donibristle, and had failed to hear the signal for the working-parties to go ashore. Then, afraid of being found on board by the pirates, he had lain low till the following day.
The Old Man accepted the statement without comment, but he fully expected that any day the "drummer" would openly join the pirates.
To prevent him from "walking in his sleep" and stumbling across the men working on the edge of the cliff, Miles was now closely watched by three of the Donibristle's crew, with instructions from the Old Man that if the fellow attempted to leave his hut before daybreak he was to be forcibly detained.
"I can't do more simply on suspicion," the skipper confided to Burgoyne. "If I were sure that the miserable blighter was playing a dirty trick, over the cliff he'd go one dark night, or my name's not Roger Blair."
In single file and with the utmost caution the five adventurers made their way to the cliff immediately above the caves that Burgoyne had noticed during the fishing expedition. From the huts where the pirates lived when ashore came the sounds of boisterous revelry. Not a light was visible on the island, but the silhouette of the look-out hill stood out sharply against the starry sky. There were alert men stationed on that lofty perch, but whether they could discern the five figures working silently on the edge of the cliff was extremely doubtful, since the latter did not cut the sky-line. Nor could the pirates on the hill command the expanse of beach below the cliff.
Muffling the head of one of the crow-bars with a piece of wet canvas Jasper Minalto drove the iron rod deeply into the ground. The operation was anxiously watched by the rest, fearful lest even the dull thuds of the wood that served as a maul would betray their presence.
"All right, so far," declared Alwyn. "Carry on, Minalto."
A second crow-bar was driven home at about a foot from the first and parallel with the edge of the cliff. Between these and about six inches from the ground the third bar was lashed horizontally. Under the fork thus formed a stout beam was thrust, until its end projected three feet into space, with fifteen feet left resting on the turf. The beam had been removed under cover of darkness from one of the tumble-down huts, and must needs be replaced before dawn.
To the outward end of the projecting piece of timber the snatch-block had been securely strapped. Then the end of the coil of rope was pressed over the sheave, a "bowline on the bight" having been made to accommodate the descending man.
"All ready, I think," said Burgoyne quietly. "Stand by, and when I'm ready, lower away handsomely."