Isabel Egenton Ostrander was an American writer known for her contributions to mystery fiction in the early twentieth century. Born in September 1883 in New York, New York, she developed a talent for creating intricate and suspenseful narratives that captivated readers of her time. Throughout her career, she wrote under her own name as well as several pseudonyms, including Robert Orr Chipperfield, David Fox, and Douglas Grant. There are also instances where Christopher B. Booth is associated as one of her pseudonyms, though this is sometimes debated. Ostrander's works often explored the complexities of crime, the nuances of human psychology, and the tension between appearance and reality. Her ability to build atmosphere and weave intricate plots earned her a dedicated following. She passed away on 26 April 1924 in Long Beach, California, at the age of 40. Her stories remain a testament to her skill in blending suspense with insightful observations about human nature and societal expectations.