The Book of Purgatory is a comic adaptation/reinterpretation + crossover story between classical works of literature, depicting the stories themselves, and what could have happened after their endings. At the forefront of this story is Doctor Faust, and his demonic companion Mephistopheles.
Margaret seems to be too perfect of a girl for Faust to think he deserves, but Mephistopheles encourages him toward more fatal pursuits…
Some quotes are directly from the Kaufmann English translation of Goethe’s Faust.