'Knockout' is the next novel in the Hell’s Belles series by Sarah MacLean, featuring Lady Imogen Loveless, a woman known for her wild curls, wilder ideas, and a knack for experiments and explosives. As a member of the Hell’s Belles—a group of vigilantes—she operates under the radar in London society. Thomas Peck, a brilliant detective who rose from tough beginnings, is tasked with keeping an eye on Imogen. Despite his initial reluctance, he is drawn into her adventurous world, where passion and peril are intertwined.