The boys re-entered the chamber, and listened until the sound of his retreating footsteps above had died away. Then Warrender switched on the light, took a sheet of paper from the top of the bale, folded it, and put it into his breast pocket.
"Now for home," he whispered. "We've something for Percy to start a new theory on."
CHAPTER XVI
WATERMARKS
As they began to retrace their steps through the tunnel, Armstrong said--
"If we count our paces we shall have some sort of an idea where we've been to. We know the tunnel runs pretty nearly due east from the ruins, and there must be a building at the end. It seems to me it's a choice between the Red House and that old tower. There's no other."
"True. Well, we'll both count. Bet you we don't agree."
"People never do agree when the count is a long one. Besides, we can't keep step in the dark, unless we left-right all the way, and I'm hanged if I do that!"
They started. Suddenly Warrender stopped.
"I say, we shall look pretty green if some one has discovered that open trap in our absence--Rush, for example."