Flight of the Red Dog — Robert Barr

The book is a fact-based, fictionalized story of two aviators doing espionage work for US and British intelligence agencies in 1939. Their around-the-world mission is predicated on geodetic survey. The times are poignant, while both the Nazis and Japanese are seeking world domination. The pilots are seeking evidence of world conquering avarice, and they find it through energy and oil-seeking efforts of the Axis powers. Neither the Nazis nor Japanese can know the truth of the pilots mission, or else troubles will follow. Throughout the book, the pilots must avoid disclosure and its grim consequences or death from exceedingly dangerous flying conditions to include flak.