Detective fiction, the sub-genre of crime fiction, has always provoked an intense interest among the readers and served them as a leisure activity, especially the works of Agatha Christie known as the “Queen of Crime.” Since many scholars, critics and academics tend to focus more on the figures of Agatha Christie’s most famous detectives Hercule Poirot and Miss Marple and less on her fictional villains, this master’s thesis deals with different portrayals of male and female murderers in the selected novels of Agatha Christie: And Then There Were None, The Murder of Roger Ackroyd, Lord Edgware Dies and Appointment with Death. The paper offers an insight into the historical and social context of interwar Britain, specifically from 1918 to 1939, in order to understand the period in which the novels were written. The changes after the First World War were also reflected in shifting or renegotiating traditional gender roles, especially those of women who began to participate more actively in the male-dominated English society. This thesis aims to analyse how Agatha Christie’s male and female murderers both conform to and challenge gender norms, revealing the complex interplay of power, gender identity, and societal expectations in the context of detective fiction during the interwar period.