In 1875, Sisi, the Empress of Austria, is the woman that every man desires and every woman envies. Beautiful, athletic and intelligent, Sisi has everything - except happiness. Bored with the etiquette of the Hapsburg Court and her dutiful but unexciting husband, Sisi comes to England to hunt. She comes looking for excitement and she finds it in the dashing form of Captain Bay Middleton, the only man in Europe who can outride her. Ten years younger than her and engaged to the rich and devoted Charlotte, Bay has everything to lose by falling for a woman who can never be his. But Bay and the Empress are as reckless as each other, and their mutual attraction is a force that cannot be denied.