Sleuth is a term used to describe a detective or investigator, and is often associated with two of the most famous fictional detectives in literature: Sherlock Holmes and Hercule Poirot. Both characters are renowned for their ability to solve complex mysteries through keen observation and logical deduction. Sherlock Holmes is a British detective created by Arthur Conan Doyle in the late 19th century, while Hercule Poirot is a Belgian detective created by Agatha Christie in the early 20th century. Both characters have been featured in numerous books, films, and television series.