They both stood listening. There were the thud of hammers, the rasping of a saw, and the clatter of wood from the other side of the wall.
"What can they be doing?"
"I can't think."
"Can you see them?"
"They are too near the wall."
"I think I can manage," said De Catinat. "I am slighter than you." He pushed his head and neck and half of one shoulder through the gap between the bars, and there he remained until his friend thought that perhaps he had stuck, and pulled at his legs to extricate him. He writhed back, however, without any difficulty.
"They are building something," he whispered.
"Building!"
"Yes; there are four of them, with a lantern."
"What can they be building, then?"