The Mannerheim Line - Joe Lyons & Jimmy Carson, #1

Two Americans, Jimmy Carson and Joe Lyons, meet while flying for the Loyalists during the Spanish Civil War. After the Loyalist surrender, they fly freight for a Canadian company based in Gibraltar. In 1939, Carson and Lyons offer their services to the Finnish government and fly French built fighters during the Russo-Finnish War. After the Finns surrender, both men return to Gibraltar where they are imprisoned.
President Roosevelt intervenes and they are released to fly for the British. After the United States enters the war, Lyons remains in England while Carson is assigned to the China-Burma-India Theater. Carson and Lyons meet again during the Berlin Airlift and the Korean War then go their separate ways. In 1961, Lyons is killed when his B-26 is shot down at the Bay of Pigs. Unwilling to admit Americans were involved; the CIA devises a cover story to explain Lyons' death.
Years later, Carson decides to investigate and uncovers a bizarre incident...