"For the present," said Alden, "we'll make no move; we'll just sit tight. There's maybe a lot to arrive yet."
Just before the breeze came creeping up from the river again, thud-thud-thud was borne to their ears. Another car was approaching.
CHAPTER XVI
THE LAMP AND THE MASK
"10761," said Alden. "I wonder whose car that is."
None of the watchful trio had any idea. But whomever was within it, the second car performed exactly the same man[oe]uvres as the first, and, a few moments after its appearance, was lost to sight and hearing once more.
But a matter of seconds later, came the familiar thud-thud-thud; and a third car plunged up the hill and went swinging around the drive. Again, no one of the three was able to recognise the number. Out by the further gate of the drive it passed, turned, and flashed by them in the darkness, to go leaping down the slope.
"Three," said Alden. "I wonder if there's any more."
His tone was thoughtful.