In this novel, Mary Shelley returned to The Last Man's message that an idealistic political system is impossible without an improvement in human nature. This historical novel, influenced by those of Sir Walter Scott, fictionalises the exploits of Perkin Warbeck, a pretender to the throne of King Henry VII who claimed to be Richard, Duke of York, the second son of King Edward IV. Shelley believed that Warbeck really was Richard and had escaped from the Tower of London. She endows his character with elements of Percy Shelley, portraying him sympathetically as "an angelic essence, incapable of wound," who is led by his sensibility onto the political stage.