Is He Popenjoy?

Is He Popenjoy? (1878) by Anthony Trollope is a novel of British Victorian mores, based on an infamous social scandal of the day having to do with a disputed noble inheritance.
In true Trollope fashion, marital issues and heartwarming sensibilities are mixed into a cauldron of wit, humorous satire, and notions of propriety (including the amusing introduction of the decidedly shameless dance called "the Kappa-kappa"), with Mary Lovelace, a young woman at the heart of the complex multi-layered story that poses and finally answers the question "who is Lord Popenjoy."