Agatha Christie's Hercule Poirot is a fictional Belgian detective known for his meticulous approach to solving crimes. First introduced in the novel "The Mysterious Affair at Styles" in 1920, Poirot is characterized by his distinctive appearance, including his egg-shaped head and fastidious nature. He often employs his "little grey cells" to unravel complex mysteries, making him one of the most famous detectives in literature. Poirot appears in over 30 of Christie's works, including novels and short stories. His adventures often involve intricate plots and a cast of intriguing characters, showcasing Christie's talent for crafting suspenseful narratives. The detective's popularity has led to numerous adaptations in film, television, and stage productions.