William Monk is a fictional character created by author Anne Perry. He is a private detective in Victorian London, known for his keen observational skills and determination to solve complex cases. Monk's background as a former police officer adds depth to his character, as he grapples with his past and the social issues of his time. Throughout the series, Monk often collaborates with Hester Latterly, a nurse who provides insight into the medical aspects of their investigations. Together, they navigate the challenges of crime and morality in a rapidly changing society, making the stories both engaging and thought-provoking.