In Georgette Heyer's novel "An Infamous Army," a significant highlight for the guests is the arrival of La Catalani, who captivates everyone with her presence. Lord Robert mentions her remarkable sharpness, indicating a combination of wit and perception that leaves a memorable impression on the attendees. Her arrival proves to be a standout moment amidst the festivities.

Colonel Fremantle, who engages with La Catalani, seems to echo Lord Robert's sentiments about her keen intelligence. The characterization of La Catalani as a standout figure in the narrative showcases her allure and the pivotal role she plays during the gathering, further enriching the social dynamics of the story.