a creaking noise, a section of the panelling swung inward, revealing a dark opening.
“Entrez, Messieurs et Mesdames,” said Bundle dramatically. “Walk up, walk up, dearies. Best show of the season, and only a tanner.”
Both Lemoine and Battle were provided with torches. They entered the dark aperture first, the others close on their heels.
“Air’s nice and fresh,” remarked Battle. “Must be ventilated somehow.”
He walked on ahead. The floor was of rough uneven stone, but the walls were bricked. As Bundle had said, the passage extended for a bare hundred yards. Then it came to an abrupt end with a heap of fallen masonry. Battle satisfied himself that there was no way of egress beyond, and then spoke over his shoulder.
“We’ll go back, if you please. I wanted just to spy out the land, so to speak.”
In a few minutes they were back again at the panelled entrance.
“We’ll start from here,” said Battle. “Seven straight, eight left, three right. Take the first as paces.”
He paced seven steps carefully, and bending down examined the ground.
“About right, I should fancy. At one time or another, there’s been a chalk mark made here. Now then, eight left. That’s not paces, the passage is only wide enough to go Indian file anyway.”
“Say it in bricks,” suggested Anthony.
“Quite right, Mr. Cade. Eight bricks from the bottom or the top on the left-hand side. Try from the bottom first—it’s easier.”
He counted up eight bricks.
“Now three to the right of that. One, two, three—HulloHullo, what’s this?”
“I shall scream in a minute,” said Bundle, “I know I shall. What is it?”
Superintendent Battle was working at the brick with the point of his knife. His practised eye had quickly seen that this particular brick was different from the rest. A minute or two’s work, and he was able to pull it right out. Behind was a small dark cavity. Battle thrust in his hand.
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