Abstract
This paper endeavors to discuss how to determine lie detection in detective fictions, taking three of the most famous works written by Agatha Christie for data------Death on the Nile, The ABC murder, In the Murder of Roger Ackroyd. Methodologically, the research will use conversation analysis, together with body language. In order to find out how to distinguish truth in conversation, this paper analyzes context of conversation and body language, throughout data in three books. This paper finds that the context of conversation between detectives and suspects is crucial in judging criminals, and body language benefits most for revealing lies. The integration of the two helps determine lie detection, ultimately contributing to catching criminals.
Keywords   conversation analysis   context of conversation   body language 

本文主要以阿加莎•克里斯蒂的三部非常著名的作品——《尼罗河上的惨案》、《ABC谋杀案》、《罗杰疑案》为例，分析研究侦探小说中的谎言测定。从方法上讲，主要运用话语分析的基本理论,结合肢体语言。为了找出侦探人员辨别话语信息的方法，论文分析了话语语境在断案中的重要性，分析了肢体语言对揭穿谎言的重要性，试图总结出侦探对犯罪嫌疑人的谎言的测定的一些方法和途径。将话语的语境、谈话时犯罪嫌疑人表现出的肢体语言综合运用，能识别谎言，从而对破案起到了至关重要的作用。
关键词  话语分析   语境分析   肢体语言  

This paper is going to research lie detection in detective fictions. It will study the linguistic approach to lie detection based on three novels by Agatha Christie. It is found that detectives always integrate conversation analysis with other factors——context of conversation and body language, to detect lies.

Compared with serious novels, detective fictions should be classified into a different group. The purposes of detective novels are mainly for entertainment. Since mankind has always been keen to solve a riddle, detective stories appeal right to human desire. Edgar Allan Poe, Arthur Conan Doyle and Agatha Christie are shinning stars as detective novelists, among whom particularly Agatha Christie is honored as ‘mistress of mystery’ (Qiang Zhaohong, 2007). Agatha Christie plays a very important role in the history of detective fictions.