Anna Katharine Green (1846–1935) was a pioneering figure in the American detective and mystery fiction genre. Often lauded as 'the mother of the detective novel', Green's literary contributions extended beyond just mere entertainment. Her intricate plots and methodical character development set the standard for future detective stories and influenced a multitude of writers, including Agatha Christie. Green debuted with 'The Leavenworth Case' (1878), which gained widespread acclaim for its attention to legal accuracy and was noted for its unprecedented use of a detective as the protagonist—an approach that would become a staple in the genre. Green continued to write well into the twentieth century, amassing a body of work that included not only novels but also poetry and short stories. Her compilation 'ANNA KATHERINE GREEN Ultimate Collection' offers a comprehensive view of her contributions to literature. Green's works are characterized by their attention to detail, complex narratives, and the role of strong female protagonists, which was innovative at the time. A forensic and procedural precision permeates her tales, predating and arguably informing the 'whodunit' approach that later became synonymous with detective fiction. Her writing displayed an empathy for human frailty while also celebrating intellectual prowess, thus paving the way for future generations of crime writers.