Maybe Re-Read: The Blood of Victory by Alan Furst, 2002, 9780375505744.
I have been focused on reading some of the many books I own and never got around to cracking open. I'm no Bill Crider but I have a few boxes worth of fiction and nonfiction I've picked up at used book sales. I had not read a Furst novel in quite a while and grabbed this one that was discarded by Maricopa County Library System when we lived in Phoenix.
I might have read this before. I'm not sure. Since I have read or listened to several Furst novels I may be confusing his style and fondness for Eastern European spies and refugees.
IA Serebin is a poet and journalist whose wartime photo during the Russian Revolution made him slightly famous. Serebin's slight celebrity even garnered an invite to dinner with Stalin and the fish eye by a Army general. Serebin skipped out to Paris before any Stalin purges hit him and has been working with a org that assists and socializes Russian exiles.
Serebin is riding as a passenger on a Black Sea cargo ship bound for Turkey and starts shtupping a fellow passenger, the wife of a Count. The Count doesn't care. Serebin hits Constantinople, decides to call it Istanbul, and goes to visit his tubercular ex-girlfriend in the country house he bought her. They are old friends from their Odessa youth and her helped her get away from the commies.
While staying in Istanbul Serebin is helping out with the local Russian ex-pats. During an ex-pat party Serebin is called away and misses the bombing that kills most everyone else. He is later contacted by Count's Wife and is slowly and slyly recruited into a British spy operation.
This is before Operation Barbarossa and Russians are okay living in occupied Paris. Serebin works there a while and then heads into Hungary, Bulgarian, and Romania to try and rebuild an information network developed by an industrialist over the past couple decades. Serebin and Count's Wife get emotionally close. Serebin survives the Nazi takeover of Romania.
The meat of story comes as Serebin and Co. try to figure out how to stop or impede the flow of oil from Ploesti, Romania to Germany. The oil fields are heavily guarded and too massive an area for sabotage. Serebin and Co. focus on trying to somehow block the Danube.
Sneakiness and subterfuge ensue. Serebin wonders who people really are. Serebin wonders how he will survive. Serebin writes a little poetry. Furst supplies another happy-ish ending with Serebin and Count's Wife escaping to Turkey.