narrative focuses on an aviator, Joyce-Armstrong, who discovers a terrifying phenomenon while attempting to break altitude records in his aeroplane. The story unfolds through the fragmented notes of Joyce-Armstrong, detailing his ominous encounters high in the atmosphere and culminating in a chilling exploration of unseen dangers that lurk in the skies. His investigation into the mysterious disappearances of fellow aviators serves as the backdrop for the tension that builds as he prepares for a fateful flight. The vivid descriptions of his thoughts and experiences effectively set the tone for the eerie and unsettling themes present throughout the collection. (This is an automatically generated summary.)