Margaret Duffy, writing as Ingrid Langley and Joanna McKenzie, is a prolific British crime fiction author known for her intricate and often dark mystery novels. Her writing style is characterized by detailed plotting, atmospheric settings, and a focus on the psychology of both the victims and perpetrators. Duffy frequently explores themes of obsession, betrayal, and the darker aspects of human nature, creating suspenseful and challenging reads for fans of the genre.
She has authored over 28 novels across multiple series and as a standalone author, showcasing her versatility and consistent ability to deliver gripping mysteries. Duffy's work is often praised for its clever twists and turns, and her ability to craft compelling characters that readers become invested in. Her extensive catalogue has cemented her position as a significant contributor to the British crime fiction landscape.

























