This reference work serves as a comprehensive catalog of the characters, settings, and thematic elements found within the extensive bibliography of Agatha Christie. Randall Toye, a dedicated researcher of Christie's work, compiles detailed entries that provide context for the vast array of individuals appearing in her novels and short stories. The text functions as an essential index for scholars and enthusiasts seeking to navigate the intricate web of the author's fictional universe.

The work is regarded as a foundational resource for Christie scholarship, providing a structured and accessible guide to her complex narrative world. Its systematic approach remains a standard reference for those analyzing the development of the detective genre.