There is no doubt that, as long as human curiosity remains, the detective novel continues to play its deadly appeal in all its forms. In Britain, Agatha Christie the “murder queen”, has been dead for nearly 30 years, but her collection of novels and short stories is still on sale. Agatha Christie’s book remains attractive all over the world. Every book is a clever structure. The characters she used were easy to identify, and her plot developed almost like a clock. But above all, all her stories are confusing the reader. In the process of solving these problems, readers can enjoy it. This paper discusses the charm of Agatha Christie's detective novel through the analysis of her work Death on the Nile.

2 The Characteristics of Different Images

Agatha Christie has created many classic characters in her many works. Subtle character design is one of the important factors of Agatha Christie’s success in detective novels. The features of different images in Agatha Christie’s novels are illustrated by detective and non-detective images.

2.1 The Characteristics of the Detective Image

The character image is the soul of the novel. If there is no elaborate character design, there are defects in the wonderful novel. Agatha Christie’s famous detective image Poirot is the first appearance in the The Mysterious Affairs at Styles. It was during the war that he and his Belgian compatriots, seven in all, took refuge in Stiles in the remote countryside of England and were taken care of by Mrs. Ingerthorpe, master of the Stiles estate. His image was a bit funny: a little man with a majestic face, a round head, often leaning to one side, a thick black moustache on his upper lip, and too neat to dress. “If he had a little dust on his clothes, it would be more painful than being shot,” he said. These basic features will continue to be reinforced in subsequent appearances, his moustache gradually tilts to the sides, his shoes polished, and his appetite for greasy, sweet foods. And, obviously, the ease of living led to the luxury of his habits, and he became an aged playboy. In the eyes of the British, the peoples of the lowlands are, without a doubt, countrymen, and, in the end, nothing more than a rustic, as well as Poirot. But the first ludicrous impression would be reversed at the end of every event, and he had magically unravelled one mystery after another, and he was always proved right, and the dwarf became an elf. In Agatha Christie’s autobiography, Agatha Christie says that Poirot came from Belgian refugees in her parish during World War I. She seemed to have a bad impression of the refugees, suspicious, grumpy, solitary, conservative and eccentric in their way of life. Agatha Christie, like a whim, used Poirot without expecting him to exist for decades. The first features, which had been adopted, did not prevent him from acting, and gave him further details. Apart from the character traits of shrewdness, cleverness and skillfulness, I think the most important thing is that Poirot is always tidying things up, everything is in pairs and everything is neat.

In Agatha Christie’s writings, the most famous character in the Death on the Nile is the Belgian detective Poirot. Although a Belgian, Poirot was a French gentleman. Chubby, well-groomed, courteous, with a mustache of his own great satisfaction, an elegant woman. Poirot’s mantra was: "I am a Belgian." Sometimes he eavesdrops, sometimes he deceives, and he has a very high demand for good food. The image of such a funny little old man jumped to paper. And those sharp eyes could penetrate the mystery of any murderer. His appearance was quiet, and his brain was constantly thinking, gathering people together after uncovering all the secrets to announce who the murderer was. Hastings, his best friend, was a typical English gentleman, polite and elegant, but he is always easily misled by the murderer. The two men, like Conan Doyle’s novel, Holmes and his partner Watson, complement each other.

Mrs Oliver, who was also a detective and also by Agatha Christie, was much more confused. Like many other middle-aged British women, the imaginative detective was warm, verbose and noisy. In the course of solving the case, she seemed to be the combination of Hastings and Poirot. Often thinking of going in the wrong direction, and she always touched the doorway. Finally, She found the real killer by accident. She is a less reliable detective. Miss Marple, the old lady in her seventies and eighties, was much steadier than Mrs Oliver. She is always in a leisurely manner, drinking tea, knitting, remembering fun when they are young, with their own side years of life experience to analyze the case.