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A hard-edged San Francisco detective agency co-founded by Sam Spade, known for its involvement in the hunt for a priceless statuette in 'The Maltese Falcon'.

Regarded as the first detective in fiction, C. Auguste Dupin, is the creator of the investigative method used to solve complex and bizarre crimes in Paris.

Based in Botswana, this agency is run by the tenacious and wise Precious Ramotswe, focusing on cases that affect the daily lives of her customers, often solving them with intuition and keen understanding of human behavior.

An agency led by the charming and intelligent aristocrat Lord Peter Wimsey who applies his sharp wit and social connections to crack complicated cases.

A legendary London-based detective agency that specializes in solving seemingly unsolvable mysteries. Led by Sherlock Holmes with the assistance of Dr. John Watson.

A historical private detective agency known for espionage and law enforcement, made famous in fiction and known for employing some of the first female detectives, notably Kate Warne.

A premier detective agency led by the meticulous Belgian detective Hercule Poirot, known for his use of 'the little grey cells' to solve complex crimes.

A New York City-based agency, with a brilliant, albeit eccentric, detective Nero Wolfe who rarely leaves his home and relies on his assistant Archie Goodwin to collect evidence.

A gritty detective agency run by the no-nonsense, hard-boiled detective Philip Marlowe, who navigates the seedy underbelly of Los Angeles.

Founded by Dirk Gently, this agency operates on the principle of 'fundamental interconnectedness' to solve mysterious cases, often with elements of time travel and the supernatural.

Not an official agency, but the elderly sleuth Miss Marple uses her intuition and understanding of human nature to solve mysteries in and around her village of St. Mary Mead.