Robert, remembering the underground passage and the treasure, had brought a candle and matches, but these were not needed.
The cell was a little white-washed room about twelve feet long and six feet wide.

On one side of it was a sort of shelf sloping a little towards the wall.

On this were two rugs, striped blue and yellow, and a water-proof pillow.

Rolled in the rugs, and with his head on the pillow, lay the burglar, fast asleep.

(He had had his tea, though this the children did not know--it had come from the coffee-shop round the corner, in very thick crockery.) The scene was plainly revealed by the light of a gas-lamp in the passage outside, which shone into the cell through a pane of thick glass over the door.
'I shall gag him,' said Cyril, 'and Robert will hold him down.