The American publishers were unhappy with the open-ending in the book and so commissioned Rankin to complete the story for the American market.
ðɪ ɐmˈɛɹɪkən pˈʌblɪʃɚz wɜːɹ ʌnhˈæpi wɪððɪ ˈoʊpənˈɛndɪŋ ɪnðə bˈʊk ænd sˌoʊ kəmˈɪʃənd ɹˈæŋkɪn tə kəmplˈiːt ðə stˈoːɹi fɚðɪ ɐmˈɛɹɪkən mˈɑːɹkɪt.