He took her hand, and pressed it. And silence fell again, as the long vigil started, there in the shadow of the tower, on the roof.
For some quarter of an hour, neither spoke. Then at last, said Stern: "See, now! The lights seem to be winking out. The canoes must have come close in toward the shore of the island. They're being masked behind the trees. The people--whoever they are--will be landing directly now!"
"And then?"
"Wait and see!"
They resigned themselves to patience. The girl's breath came quickly, as she watched. Even the engineer felt his heart throb with accelerated haste.
Now, far in the east, dim over the flat and dreary ruins of Long Island, the sky began to silver, through a thin veil of cirrus cloud. A pallid moon was rising. Far below, a breeze stirred the tree-fronds in Madison Forest. A bat staggered drunkenly about the tower, then reeled away into the gloom; and, high aloft, an owl uttered its melancholy plaint.
Beatrice shuddered.
"They'll be here pretty soon!" whispered she. "Hadn't we better go down, and get our guns? In case--"
"Time enough," he answered. "Wait a while."
"Hark! What's that?" she exclaimed suddenly, holding her breath.
Off to northward, dull, muffled, all but inaudible, they both heard a rhythmic pulsing, strangely barbaric.
"Heavens!" ejaculated Stern. "War-drums! Tom-toms, as I live!"