The granddaughter of Rasputin, Felicia provides the hemophiliac Tsar Alexei with the blood transfusions that keep him alive until she discovers her true heritage and what she is capable of, making her a target in the capital of the Holy Russian Empire where only her courage will keep her alive.

Exposed as an unregistered spellbreaker by an assassin she refuses to join, Elsie is forced into a marriage of convenience with an elite magic user while she secretly endeavors to track down and eliminate 19th-century England's most devious criminal.