The provided text focuses on the definition and subgenres of thriller fiction, not on Edgar Barclay.
The provided Wikipedia extract defines thriller fiction as a genre characterized by suspense, excitement, and anticipation. It notes that thrillers often incorporate elements from subgenres such as crime, horror, and detective fiction. The text elaborates on the emotional responses these narratives aim to evoke in readers, including heightened feelings of surprise, anxiety, and eagerness. While the extract lists various sections (A, B, C-D, etc.) and related topics like spy fiction and lists of crime and mystery writers, it does not contain any information specifically about the author Edgar Barclay, his works, or his contributions to any particular field, including esoteric or occult subjects. The external links section directs to the International Thriller Writers organization.