CHAPTER XX.
The Leads.
Ascending a short flight of steps, Jack found at the summit a door, which being bolted in the inside he speedily opened.
The fresh air, which blew in his face, greatly revived him.

He had now reached what was called the Lower Leads,--a flat, covering a part of the prison contiguous to the gateway, and surrounded on all sides by walls about fourteen feet high.

On the north stood the battlements of one of the towers of the gate.

On this side a flight of wooden steps, protected by a hand-rail, led to a door opening upon the summit of the prison.
This door was crested with spikes, and guarded on the right by a bristling semicircle of spikes.

Hastily ascending these steps, Jack found the door, as he anticipated, locked.