An American novel was made into a French film, and the mystery film," unspeakable," couldn't be said to be a good adaptation because the quality of the adaptation depended on the success of the adaptation. The adaptation of film and television literary works should be based on the plot, characters, theme and other aspects of the original work to better adapt to the needs of film and television creation. If it was adapted properly, it could improve the visual effects, story structure, character shaping, and other aspects of the film, thus improving the quality of the film. However, if the adaptation was not done properly, it might lose the essence of the original work and reduce the value of the film. " Secret " was a suspense film directed by French director, Chris Nolan, and adapted from Christie's novel of the same name. The film's outstanding performance in visual effects, story structure, character creation, and other aspects had won many international film awards. However, due to the differences between the film adaptation and the original work, the audience's understanding and acceptance of the film may be different. Therefore, the quality of the adaptation needed to be judged based on the audience's preferences and the actual situation of the film.