Molly O'Malley, lady's maid to the progressive Lady Amanda Halloway, is determined to continue the life's work of her lost love, killed in the Peterloo Massacre. But when her efforts and a trip to Lady Halloway's charitable orphanage culminate in her own abduction, Molly's eyes are opened to the horrifying crimes transpiring in the city's slums. Despite the risks, she broadens her mission and is drawn ever closer to the peril all around them.

Thomas Flaherty, a footman in the Halloway household, has been with Molly from the beginning, but he fears she will never trust him with her heart. Even though her cause and happiness are of foremost importance to him, his loyal patience is tested by the fears that keep her at a distance. But with their safety on the line, Thomas is resolved to sacrifice everything for the woman he loves.

Risking their lives and their love, Molly and Thomas and a team of nobles on their side will stop at nothing to empower the powerless, no matter the personal cost.