Detective D.D. Warren is a fictional character created by author Lisa Gardner. She is a seasoned detective with the Boston Police Department, known for her sharp instincts and determination to solve complex cases. D.D. often grapples with the psychological aspects of crime, making her a compelling figure in the world of crime fiction. Throughout the series, D.D. faces various challenges, including personal struggles and the impact of her job on her life. Her character appears in several novels, including Alone, The Neighbor, and Find Her, showcasing her growth and resilience as she navigates the dark side of human nature.