Stolen Empire, book 1: Queen of Someday
Sherry Ficklin2014

Upon her arrival at the Winter Palace in Saint Petersburg, Princess Sophie of Anhalt-Zerbst immediately begins her quest for the hand of Grand Duke Peter, heir to the Russian throne. Marrying the prince will secure her family's lands and titles and save her from an unwanted marriage to her uncle. Surrounded on all sides with potential enemies, lovers, and political allies, Sophie struggles to reconcile her duties with her desires.