Bloody Sunset — Alexander Fullerton

 
In this WWI military thriller, a British Royal navy officer finds himself on a rescue mission for the Russians.

In the aftermath of the Russian Revolution, Lieutenant Bob Cowan of the British Royal Navy must rescue a party of five women, including two of the Tsar's daughters. With the women holed up in a refuge a hundred miles up the Astrakhan river, this will be easier said than done.

Astrakhan, where the Volga empties into the Caspian, was a Bolshevik stronghold, sizeable naval base and army command of half a million men. And the British Navy is here to fight Turks and Germans, not Bolsheviks.
How can anyone be sure -- in a climate of treachery and deception -- that this isn't a trap? Getting in there will be difficult enough, what chance will he have of getting out?