Death Flies the Equator

Published in Flying Aces, March 1937.
"A haunted look came over the Admiral’s face. "That lost Wapiti," he told Knight, "was found high on the beach at Crazy Day Atoll—that tiny mid-Pacific dot lying exactly at the point where East meets West, and North meets South. Underneath
the island’s single palm tree sat the pilot and observer. Their bodies were stark as in death—yet they still lived! Their eyes were open—but they were eyes which only stared unseeing over the broad wastes of the sea."
Richard Knight and his colleague Doyle go up against the 'Four Faces', the deadliest secret society on earth - with "enough assassins on its roster to fill a regiment".