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In page The Last Man:

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The Last Man received the worst reviews of all of Mary Shelley's novels:[citation needed] most reviewers derided the very theme of lastness, which had become a common one in the previous two decades. Individual reviewers labelled the book "sickening", criticised its "stupid cruelties", and called the author's imagination "diseased".[1] The reaction startled Mary Shelley, who promised her publisher a more popular book next time. Nonetheless, she later spoke of The Last Man as one of her favourite works.