The 1912 Stockholm Olympics should be a triumphant stage for Grand Duchess Olga Romanov and her sisters Tatiana, Maria, and Anastasia - an exciting escape from palace life and a chance to support Dmitri Sherpov, Russia's rising equestrian star, and his horse, Komet.

But when Dmitri and Komet vanish on the day of their competition, Olga and Tatiana must rely on their wit, courage, and royal connections to unravel a conspiracy that goes deeper than anyone imagined.

Meanwhile, Maria and Anastasia befriend Ellie, a determined British swimmer chasing a medal and a scholarship to America. When Ellie starts receiving threatening messages, the sisters band together to uncover who's trying to shatter her Olympic dreams.

With danger closing in from every side, the Romanov sisters are forced into a race against time to protect new friends and expose the dark secrets lurking beneath the Olympic spotlight.