But now they rode as night's children slipping unseen through the sleeping world.

He checked on this belief by slipping unseen to the basement.

After a minute slipping unseen through the forest he arrived at the administration block.

And they were there all day, until dark, when they could slip away unseen.

All he had to do was move silently through the shadows by the wall, slip unseen out of the cave, and run like hell.

If the diversion worked, he'd have a few seconds to slip unseen inside the garage.

Those who still live there try to slip unseen out of their front door as if leaving assignations.

If the visitor had been announced, she herself could have slipped away unseen.

The two men slipped unseen from the grounds and went back to their parked car.

Years of practice had taught him to slip unseen through shadows, to move silently in the darkness.