Oliver evidently got in here, climbed the stairs in the turret to enjoy the view and fell from the parapet.

And why his body hasn't been found before I'll now show you." He led the way to the extreme foot of the Keep, and to a very low-arched door, at which stood a couple of the estate labourers, one of whom carried a lighted lantern.

To this man the Squire made a sign.
"Show the way," he said, in a low voice.
The man turned and descended several steps of worn and moss-covered stone which led through the archway into a dark, cellar-like place smelling strongly of damp and age.

Greyle drew the attention of his companions to a heap of earth and rubbish at the entrance.
"We had to clear all that out before we could get in here," he said.
"This archway hadn't been opened for ages.

This, of course, is the very lowest story of the Keep, and half beneath the level of the ground outside.