And it such a vague gray ghost that Jimmy slowly came onto now.

No wonder the thing had seemed a gray ghost, even to The Shadow!

Rain was falling; it twisted in the air like grey ghosts.

"I'm ready to run with the best of you gray ghosts."

The team was also known as the gray ghosts.

Incense drifted like memory through the air, hanging low, a gray ghost come to seek him.

But the fleck was there again, a black dot on the gray ghost of a planet.

A silent, secret attack, flitting gray ghosts in the dawn.

Like a gray ghost it remained there, an indistinct shadow, all but invisible.

But his gray ghost will vanish in at most a few more hours.