Judith Pella & Michael Phillips 
Crown and the Crucible (The Russians Book #1) 

Amid the turbulence of prerevolutionary Russia, the lives of two families become inextricably entwined. When Anna Burenin leaves her tiny village to work in St. Petersburg, she is thrust into the life of the spoiled Princess Katrina Fedorcenko. Soon both peasant and princess will face the prospect of their beloved Russia being torn apart.