Judith Pella & Michael Phillips 
House Divided (The Russians Book #2) 

As the war in the Balkans nears its end, Prince Sergei Fedorcenko returns to St. Petersburg and to his love, Anna Burenin, whose brother, Paul, has joined the revolutionaries. Torn between love for her family and devotion to the Fedorcenkos, Anna’s faith is her only comfort as she tries to keep those closest to her–and all of Russia–from becoming a house divided.