Exiled in Paris, tiny, one-hundred-year-old Mathilde Kschessinska sits down to write her memoirs before all that she believes to be true is forgotten. A lifetime ago, she was the vain, ambitious, impossibly charming prima ballerina assoluta of the tsar’s Russian Imperial Ballet in St. Petersburg. Now, as she looks back on her tumultuous life, she can still recall every slight she ever suffered,...