He touched one of the marble mouldings of the mantel-piece and made it swing round on a pivot. The marble slab itself moved and the mirror above it slid between invisible grooves, revealing a yawning gap which contained the lower steps of a staircase built in the body of the chimney itself. It was all very clean, in carefully-polished iron and white porcelain tiles.
He climbed up to the fifth floor, which had a similar opening over the mantel-piece, and found M. Dubreuil awaiting him:
"Is everything finished here?"
"Everything."
"All cleared up?"
"Quite."
"The staff?"
"All gone, except the three men keeping watch."
"Let's go up."
They climbed by the same way to the servants' floor and emerged in a garret where they found three men, one of whom was looking out of the window.