Much puzzled, Brendon delayed only to get his revolver and an electric torch. He then descended with Doria to the water and they were soon afloat again. The boat ran at full speed for a few minutes; then her course was changed and she turned in under the cliffs. Mark soon saw a solitary gleam of light, like a glowworm, at sea level in the solid darkness of the precipices, and Doria, slowing down, crept in toward it. Presently he shut off his engine and the launch grounded her prow on a little beach before the entrance of Robert Redmayne's hiding-place. The lamp shone brightly, but its illumination, though serving to show the cavern empty, was not sufficient to light its lofty roof, or reveal a second exit, where a tunnel ran up at the rear and could be climbed by steps roughly hewn in the stone. "It is a place my master showed me long ago," explained Doria. "It was used by smugglers in the old days and they have cut steps that still exist." Both men landed and Giuseppe made fast the launch. Then immediate evidence of tragedy confronted them. The floor of the cave was of very fine shingle intermixed with sand. The sides were much broken and the strata of the rock had wrinkled and bent in upon itself. The lamp stood on a ledge and flung a radius of light over the floor beneath. Here had been collected the food and drink supplied to Redmayne on the previous day, and it was clear that he had eaten and drunk heartily. But the arresting fact appeared on the beaten and broken surface of the ground. Heavy boots had torn this up and plowed furrows in it. At one spot lay an impression, as though some large object had fallen, and here Brendon saw blood--a dark patch already drying, for the substance of it was soaked away in the sandy shingle on which it had dropped. It was a blot rather than a pool and under his electric lamp Mark perceived a trail of other drops extending irregularly toward the back of the cavern. From the mark of the fallen body a ridge ploughed through the shingle extending rearward, and he judged that one of the two men had certainly felled the other and then drawn him toward the chimney, or tunnel that opened at the back of the cave. Spots of blood and the dragged impression of some heavy body stretched along the ground to the stone steps and there disappeared. The detective stopped here and inquired the length of the staircase and whither it led; but for a time his companion appeared too dazed to answer him. Giuseppe showed a good deal of the white feather, combined with sincere emotion at the implicit tragedy. "This is death--death!" he kept repeating, and between his words his mouth hung open and his eyes rolled fearfully over the shadowy places round about him. "Pull yourself together and help me if you can," said. Brendon. "Every moment may make all the difference. It looks to me as though somebody had been dragged up here. Is that possible?" "To a very powerful man it might be. But he was weak--no good."