He sneaked along the ledge to the cabin, flattened himself against the corner next the gray boulder and waited there for a minute.

He felt the flesh stiffening on his jaws as he crept up to the window to look in.

By standing on his toes, Casey's eyes came on a level with the lowest inch of glass,--the window was so high.
Just at first Casey could not see much.

Then, when his eyes had adjusted themselves to the half twilight within, his mind at first failed to grasp what he saw.

Gradually a dimly sensed dread took hold of him, and grew while he stood there peering in at commonplace things which should have given him no feeling save perhaps a faint surprise.
A fairly clean, tiny room he saw, with a rough, narrow bed in one corner and a box table at its head.