Wings of the Emerald

Published in Flying Aces, September 1937.
"Through those blood-red skies that hung like the hand of Doom over war-racked Spain, there swooped a winged, incarnate devil—a greedy ghoul men called “The Hawk.” Sparing neither Rebel nor Loyalist, this eerie fiend struck without warning. Wretched Iberia herself was his victim; ruthlessly he pounced upon her, and from her defenseless form his merciless talons tore priceless treasures. And now those bony claws clutched the gleaming “Green Madonna”—sought to wrench from that brilliant jewel a secret known only to Death."