After the successful climb, Hardie travelled with three Sherpa for several months in their home region. Joined by his wife and a friend from New Zealand, Joe Macdonald, he mapped the last uncharted areas of the Himalayas south of Mount Everest. Hardie published a book in 1957 based on his diaries, In Highest Nepal. An official translation is available in German, and a plagiarised version exists in Japanese.