A Desperate Journey by James Earl Haynes Jr. (2017)

 

It’s adventure and espionage onboard the Pacific Clipper as two spies, one American and the other a German, fly across the southwest Pacific and on to Asia, Africa and the Americas, alongside the heroic Clipper crew, they are all on a desperate journey to get home in a world tearing itself apart.

https://www.amazon.com/Desperate-Journey-James-Haynes-ebook/dp/B06WRW3SNT