Just as they disappeared behind the hill there was a sudden faint flash of light; and by-and-by, as Tom lay still listening to the counting, he heard, after a long interval, a far-away muffled rumble of distant thunder.  He waited for a while, and then arose and stepped to the top of the sand-hummock behind which he had been lying.  He looked all about him, but there was no one else to be seen.  Then he stepped down from the hummock and followed in the direction which the pirate captain and the two men carrying the chest had gone.  He crept along cautiously, stopping now and then to make sure that he still heard the counting voice, and when it ceased he lay down upon the sand and waited until it began again.

Presently, so following the pirates, he saw the three figures again in the distance, and, skirting around back of a hill of sand covered with coarse sedge-grass, he came to where he overlooked a little open level space gleaming white in the moonlight.

The three had been crossing the level of sand, and were now not more than twenty-five paces from him.  They had again set down the chest, upon which the white man with the long queue and the gold ear-rings had seated to rest himself, the negro standing close beside him.  The moon shone as bright as day and full upon his face.  It was looking directly at Tom Chist, every line as keen cut with white lights and black shadows as though it had been carved in ivory and jet.  He sat perfectly motionless, and Tom drew back with a start, almost thinking he had been discovered.  He lay silent, his heart beating heavily in his throat; but there was no alarm, and presently he heard the counting begin again, and when he looked once more he saw they were going away straight across the little open.  A soft, sliding hillock of sand lay directly in front of them.  They did not turn aside, but went straight over it, the leader helping himself up the sandy slope with his cane, still counting and still keeping his eyes fixed upon that which he held in his hand.  Then they disappeared again behind the white crest on the other side.

So Tom followed them cautiously until they had gone almost half a mile inland.  When next he saw them clearly it was from a little sandy rise which looked down like the crest of a bowl upon the floor of sand below.  Upon this smooth, white floor the moon beat with almost dazzling brightness.

The white man who had helped to carry the chest was now kneeling, busied at some work, though what it was Tom at first could not see.  He was whittling the point of a stick into a long wooden peg, and when, by-and-by, he had finished what he was about, he arose and stepped to where he who seemed to be the captain had stuck his cane upright into the ground as though to mark some particular spot.  He drew the cane out of the sand, thrusting the stick down in its stead.  Then he drove the long peg down with a wooden mallet which the negro handed to him.  The sharp rapping of the mallet upon the top of the peg sounded loud in the perfect stillness, and Tom lay watching and wondering what it all meant.