These sounds issued from unseen sources among certain of the buildings as the visitors passed.

They only looked wildly around them for the unseen source of the mocking voice.

The ring began to glow, as if a light were shining on it from an unseen source.

"Wait a minute," came a slow, deep voice from an unseen source.

It was the two men from the Wall, their robes illuminated by some brilliant but unseen light source.

The corridor he stood in and those he could see were all illuminated by the same unseen source.

There were sightings and shrieks from unseen sources out in the darkness.

It fell hundreds of feet, splashing down the far wall from an unseen source to an invisible destination.

The dark lightened, almost imperceptibly, to a glow from some unseen source.

Electric currents from unseen sources are passed through his body, he insists.