Had he then followed into the den of the animal by which poor Marquis had been so frightfully torn?
But no: it was Marquis himself waiting for him! 'Go on, Marquis,' he said, with a sigh of relief.
The dog obeyed, and in another moment a waft of cool air came in.
Presently a glimmer of light appeared.

The opening through which it entered was a little higher than his horizontally posed head, and looked alarmingly narrow.
But as he crept nearer it grew wider, and when he came under it he found it large enough to let him through.

When cautiously he poked up his head, there was the huge mass of the keep towering blank above him! On a level with his eyes, the broad, lilied waters of the moat lay betwixt him and the citadel.
Marquis had brought him to the one neglected, therefore forgotten, and thence undefended spot of the whole building.

Before the well was sunk in the keep, the supply of water to the moat had been far more bountiful, and provision for a free overflow was necessary.

For some reason, probably for the mere sake of facility in the construction, the passage for the superfluous water had been made larger than needful at the end next the moat.