Joyce-Armstrong, a brave aviator, had been curious over the deaths of certain pilots who tried to break the current height record of 30,000 feet. Recent casualties involve some strange deaths – one, Hay Connor, died after landing while he was still in his plane, while another, Myrtle, was discovered with his head missing. Joyce-Armstrong speculates that the answer to these deaths may be the result of what he calls "air-jungles":