The man obeyed. As before he locked the door after him. Directly the door clicked Dick sprang swiftly and noiselessly out of bed, crossed the room, and placed his ear to the keyhole. Hearing nothing, he peered through the narrow slit; then with a grim smile on his face he returned to his bed, at the same time holding up a warning finger to check the mystified midshipman's enquiry.

"Hello! There's a sea-plane!" exclaimed Dick about a quarter of an hour later. He hastened to one of the windows, while Farnworth, walking unsteadily from the effects of his injuries, took up his stand at an adjoining one.

The whirr of the aerial propellers grew louder and louder. The Turkish soldiers, lolling about in the courtyard within the fort, overcame their lethargy sufficiently to raise their heads and follow the course of the aeroplane.

Presently it passed almost overhead, proceeding in a south-westerly direction. It was flying low—at about two hundred feet. On the under side of the main plane were two red crescents—the distinguishing marks of the Turkish air-craft.

Hearing the whirr of the blades, other soldiers hurried from the buildings. Amongst them were two German officers.

The latter waited until the sea-plane was out of sight; then, allowing their swords to clank noisily over the stones, they walked towards the opposite side of the quadrangle, the Turkish soldiers standing stiffly at attention as they did so.

At that moment someone hailed them.

Turning on their heels the officers retraced their steps. Curiosity prompted Dick to crane his head to follow their movements. Not altogether to his surprise he discovered that the owner of the peremptory voice was the self-styled Ahmed Djezzar. In spite of being in the uniform of a Turkish bluejacket the two Germans saluted.

"No luck," he reported, speaking in German—a language that, after many mentally and bodily painful hours at school and a subsequent "roasting" at Osborne and Dartmouth, Dick could follow, with comparative ease. "No luck. The English swine do not seem communicative. I'll try them again; then, if that fails, we'll take other measures."