Sky-Fire Scourge

Published in Flying Aces, August 1938.
"Richard Knight's only clue was - a peculiar pair of dark glasses!"
"Dick Knight stepped from his car astounded. Could this field - ominously silent, 'blacked-out' like a war drome - really be Croydon, the busy sky terminal of teeming London? The American agent felt his blood chill. somehow that strange, oppressive atmosphere told him more fiendish horror was imminent - a secret horror that could not now be curbed. Yet his own friend, the haggard Haldane, dared not reveal what he knew. And the only clue was - a peculiar pair of spectacles."