Investigative/detective fiction has been always the favourite art form in the history of writing and reading. Curiosity to know the truth along with a passion towards mystery and mysterious affairs allure human beings to this artefact. Realising this huge popularity of the genre, this paper is an attempt to trace the remarkable and positive changes in the nature and treatment of crime investigation in the Malayalam mainstream cinema after the advent of Jeethu Joseph’s investigative-thriller movies. This change is more or less caused by the influence of the fictional detectives of Arthur Conan Doyle and Agatha Christie. Jeethu Joseph’s investigators are treated here as the shadowy figures of the renowned private eyes, Sherlock Holmes and Hercule Poirot.
 Research Scholar in English, TKM College of Arts & Science, Kollam.