The document provides an introduction to the typical elements found in a detective story. It outlines six key elements: 1) The detective must have unique characteristics that make them memorable. 2) The crime, usually a murder or great theft, must be significant. 3) The criminal must be an intelligent opponent who can match wits with the detective. 4) All suspects, including the criminal, must be introduced early. 5) All clues discovered by the detective must also be available to the reader. 6) The solution must seem logical and obvious when explained by the detective so that the reader feels they could have solved it as well.