What letters did Frankenstein receive and what did they say?

In Mary Shelley's "Frankenstein," Robert Walton writes letters to his sister, Margaret Saville, detailing his ambitious expedition to the North Pole. In these letters, he expresses his longing for companionship and his admiration for scientific discovery. As the story progresses, Walton recounts Victor Frankenstein's tragic tale of ambition and obsession, revealing warnings about the dangers of unchecked scientific pursuit and the quest for glory. The letters frame the narrative and highlight themes of isolation and the quest for knowledge.