In 1928, she alluded to his idea of the "superman" in notes for an unwritten novel whose protagonist was inspired by the murderer William Edward Hickman.
ɪn nˈaɪntiːnhˈʌndɹɪd twˈɛnti ˈeɪt, ʃiː ɐlˈuːdᵻd tə hɪz aɪdˈiə ʌvðə "sˈuːpɚmˌæn" ɪn nˈoʊts fɚɹən ʌnɹˈɪʔn̩ nˈɑːvəl hˌuːz pɹˈoʊɾɐɡənˌɪst wʌz ɪnspˈaɪɚd baɪ ðə mˈɜːdɚɹɚ wˈɪljəm ˈɛdwɚd hˈɪkmən.