It's important to note that there are actually two prefaces to *Frankenstein*.
* The first preface was written by Mary Shelley herself and included in the 1818 edition of the novel. It provides context for the story and explains how it came to be written.
* The second preface was written by Percy Bysshe Shelley (Mary's husband) and included in the 1831 edition. It focuses on the philosophical and ethical aspects of the novel.