"The Twelfth Hour" by Ada Leverson is a novel written in the early 20th century. Set against the backdrop of Edwardian society, the story revolves around the lives of several characters, notably the beautiful Felicity, her brother Savile, and their friends, as they navigate love, social events, and personal entanglements. The book delves into themes of romantic dilemmas and the complexities of relationships in a world of high society. The opening of the novel introduces us to Savile, who visits his sister Felicity just before a grand party hosted by their father, Sir James Crofton, a prominent politician. As the siblings engage in playful banter, we learn about their relationships with others, including Felicity's husband Lord Chetwode, who is distracted by racing, and Savile's heartache involving two young women, including the interestingly named Aunt William. The scene sets the stage for a curious mix of humor and intrigue, showcasing the expectations and pressures faced by the characters within the vibrant social milieu in which they live. (This is an automatically generated summary.)