That patch of darkness was the visible sign of an invisible being.

Similar to angels, the Jinn are spiritual beings invisible to the naked human eye.

The darkness on the floor signified the presence of some invisible being.

The fact is, we are spiritual beings, invisible while occupying the mortal body.

There were only shadows and an invisible being.

The knife was wrested from the hand that held it, as though plucked away by an invisible being.

Crouching in the darkness, Zubian waited; then took up the pursuit of this invisible being.

On the third time, the flag and flag-bearer would be carried off by an invisible being, never to be seen again.

The wall moved toward the hatch as if it were on rollers and pushed back by an invisible being.

Were the invisible beings now finally striking to destroy the audacious Earthmen?