Austen's novel Northanger Abbey is often classed as a parody of the gothic novels of the late 18th century and it refers directly to Radcliffe's The Mysteries of Udolpho. The emotion in the language of the two works (Udolpho, Northanger) is compared with the help of the Dictionary of Affect in Language, whose outcomes are also employed to depict Aristotelian plot development in terms of fluctuations in fortune and misfortune in each novel. The two novels differ stylistically (most notably in total length and sentence length), and also emotionally. Udolpho is significantly less pleasant, significantly less active, and significantly more concrete in its language than Northanger (t tests, p < .001). Plots, modeled with polynomial regressions (p < .001), indicate that there are several emotional turning points in each novel. These are labeled and described. Udolpho is characterized by a happy ending while Northanger displays a relatively unhappy ending. In an unexpected result, differences which suggest a two-part composition are noted between early (1-16) and later (17-31) chapters of Northanger Abbey.