The first fictional detective was E. A. Poe's C. Auguste Dupin, who served as a basis and inspiration not only for Sherlock Holmes, but for all other detectives to come. This eccentric proto-detective used 'ratiocination' to solve crimes; simply put, he relied on his superior intellect and imaginative power to penetrate the criminal's mind. Although Holmes did not appreciate being compared to him and scoffed at Dupin's crime-solving abilities, considering them inferior to his own, they in fact proved to be very effective.

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A man is found dead on a Sunday morning. 

His wife calls the police immediately. 
The police question the wife and staff.