This article is devoted to the consideration of the individual style of Agatha Christie on the material of works of the detective genre. The review of scientific works aimed at the study of idiostyle in modern philology is made, which corresponds to the priority areas of the humanities. The purpose of the scientific article is a detailed analysis of the idiostyle of the English writer, the definition of style constants and dominants that create a unique artistic canvas. The relevance of the study is confirmed by the fact that a new perspective of the study of the writer's creativity is presented through the definition of idiostyle features. The article makes a contribution to the development of a scientific problem – "the writer's idiosyncrasy", which justifies the theoretical significance and novelty of this work. The practical value is due to the possibility of using the materials of the article in courses, electives on the study of foreign and world literature, modern problems of philological sciences, etc.