The detective story is a story in which the main interest is a puzzling crime and the process of solving it. The Golden Age of British crime is usually considered to cover the two decades between the First and Second World Wars. The writers of the Golden Age were as varied as their talents. The majority of detectives in the Golden Age were men. In general, women characters were sidekicks to the dominant male hero, serving either as friends or love interests, or both. One reason for the popularity of detective fiction during the Golden Age was the rising middle-class readership. The term "queens of crime" refers to a group of female crime writers who climbed to dominance in the early 20th century. Four women are considered the "queens of crime": Agatha Christie, Margery Allingham, Dorothy Sayers, and Ngaio Marsh (only the first three were British). Dorothy L. Sayers was the creator of Lord Peter Wimsey. Her written works show understanding of contemporary literature, social and moral ethical issues. Margery Allingham was the creator of Albert Campion. Her characters are both vivid and complex. Her mysteries are filled with twists and turns, keeping readers guessing until the very end. Many of her books give insight into the British society of that time. Agatha Christie, creator of famous detective Poirot, has great skills as a storyteller. Her attention to detail, use of humor and irony, and focus on social issues made her books accessible and enjoyable to a wide audience.