He was imprisoned in the upper part of the Hall Tower, formerly, as its name imported, connected with the old palace, and the windows of his rooms looked into the inner and outer wards.
These windows were strongly grated, but Lord Wintoun derided this obstacle to escape.
Carefully concealed about his person, he had a couple of small files, and setting to work with these implements, he so nearly cut through the bars, that he could immediately remove them when needful.
The main difficulty was now overcome, but the windows were at a considerable height from the ground; and, moreover, there were sentinels both at the back and front, who must be eluded before an escape could be effected.
The Earl of Wintoun, however, was confident in his own ability to manage the matter, and did not doubt he should find an opportunity of getting off.
The opportunity occurred.
During the day a fog had prevailed in the City, and of course extended to the Tower. Indeed, it was thicker there than elsewhere.
Towards night the vapour increased in density. Not only was the White Tower completely hidden, but all the surrounding buildings were obscured. The sentinels could scarcely be distinguished on their posts. Links were lighted, but only served to make the darkness more palpable.
When the fog first came on, the Earl of Wintoun resolved to take advantage of the chance thus offered him, but he waited patiently till night.
No extra precaution seemed to be taken by the jailers, except that the entrance to the Hall Tower from the inner ward was fastened, but this mattered little, since the fugitive proposed to descend from the window looking towards the outer ward.