I’ve not read Frankenstein, or The Modern Prometheus, but I’m told that it has a complex narrative structure. Dorothea Wolschak explains:
In the core of the novel the Creature's story is presented to us framed by Victor Frankenstein's story which itself is enframed by Robert Walton's epistolary narrative. The overall structure of the novel is symmetrical: it begins with the letters of Walton, shifts to Victor's tale, then to the Creature's narration, so as to switch to Victor again and end with the records of Walton. In this manner the reader gets different versions of the same story from different perspectives. Mary Shelley's rather atypical approach not to stick to only one narrator and one defined narrative situation throughout the book creates various impressions on the reader of the novel.
Thus we have:
Walton (Frankenstein ((Creature)) Frankenstein) Walton