Answer :

Doyle introduced three elements in detective fiction. These are "silly friend", "arch criminal" and "forensic science".

Sir Arthur Conan Doyle was an amazing writer. He was the one who created the character of Sherlock Holmes, the most popular character in detective fiction till date.

One of the many contributions of Doyle to this genre was the introduction of three elements, which are still part of detective fiction. these elements are,

1. Silly friend:

In his stories, there is always one silly friend to whom the detective has to explain the whole case. The purpose of this character is to inform the audience about the exposition of the story.

2. Arch criminal or Napoleon of crime

There is always one character who is a very sharp and skilled criminal. In Sherlock Holmes, it was Moriarty.

3. Forensic science

The third element Forensic science, refers to a methodology for solving cases. We can see that methods such as examining finger prints, studying blood stains etc. are used in Doyle's stories.

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