In 1860s England, circus mania is sweeping the nation. When Jasper Jupiter’s Circus of Wonders pitches its tent in a poor coastal town, the life of one young girl changes forever. Sold to the ringmaster as a “leopard girl” because of the birthmarks that cover her body, Nell is utterly devastated. But as she grows close to the other performers, she finds herself enchanted by the glittering freedom of the circus, and by her own role as the Queen of the Moon and Stars. Before long, Nell’s fame spreads across the world --- and with it, a chance for Jasper Jupiter to grow his own name and fortune. But what happens when her fame begins to eclipse his own, when even Jasper’s loyal brother, Toby, becomes captivated by Nell?

In 1850s London, the Great Exhibition is being erected in Hyde Park. Among the crowd watching the dazzling spectacle, two people meet by happenstance. For Iris, an arrestingly attractive aspiring artist, it is a brief and forgettable moment. But for Silas, a curiosity collector enchanted by all things strange and beautiful, the meeting marks a new beginning. When Iris is asked to model for Pre-Raphaelite artist Louis Frost, she agrees on the condition that he will also teach her to paint. Suddenly, her world begins to expand beyond her wildest dreams --- but she has no idea that evil is waiting in the shadows. Silas has only thought of one thing since that chance meeting, and his obsession is darkening by the day.