The second in the series, a little different from his other ones. Spoilers ahead. I'm reading all these in consecutively so some of what I write might be from the first book.
WWI is ended and Quinney is at loose ends. At some point he marries Zoe, the beautiful younger sister of Annys. She was just a little girl but she grew up during the war. I'm not so sure they are in deeply in love but they are definitely fond of each other. The marriage is never strong from the start because she is a liberated woman, not content to stay at home and he's often out of the country. But they see each other here and there as they fly all over the world and each time Zoe professes her love for him.
Quinney's first post is in Russia where he's helping the White Russians fight the Bolsheviks. This takes place near Riga. This part is a bit boring as not much happens, except everything is a mess and they eventually have to leave.
Quinney then works as a private pilot for a rich British aristocrat. He spends some time in Germany. Then he goes back to the RAF where he spends more time in Germany and some in the US on odd jobs. He meets Udet here and there several times where Udet gives him (and us the readers) the lowdown on German politics. The other person Quinney sees all the time is his arch nemesis Diplock who continues to rise in the ranks by a** kissing and other nefarious deeds.
Next stop I think is the Middle East and Iraq. We're basically given a short history of the interwar years seen through British eyes and it's quite interesting.
Next stop is Shanghai, China where he has an affair with someone he meets by chance. He also makes the acquaintance of a Catholic priest O'Buhilly who he will meet again. Once again we're given a short run down of the historical and political situation in interwar China. Perhaps the biggest event there is that he flies out to rescue O'Buhilly and is captured and then escapes.
Next he is sent to the North-West Frontier where a small westernized territory is about to collapse. He flies to the British legation with orders to rescue them by air but the minister refuses to leave until its too late, almost too late but they finally get everyone out in the nick of time.
While he is there he meets Marie-Gabriella, who we met in the first book. She was only 9 at the time (10 years ago) but she has never forgotten him. She still has feelings for him and this time, him for her (since he's not happy in his marriage). But he has to tell her that he's married.
When everyone is finally rescued and back in India he finds out that Zoe has died in a crash. He is distraught and looks for Zoe but she has vanished, heartbroken because he's married and the book ends here.
This book has become part romance and part history but it's become interesting to me as I'm now vested in the Quinney character. On to the next book.