Allan Pinkerton affiliated with the notorious Banditti of the Prairie. After observing their movements for some time he informed the local sheriff, who arrested them. This later led to Pinkerton being appointed, in 1849, as the first police detective in Chicago, Cook County, Illinois. In 1850, he partnered with Chicago attorney Edward Rucker in forming the North-Western Police Agency, which later became Pinkerton & Co, and finally Pinkerton National Detective Agency, still in existence today as Pinkerton Consulting and Investigations, a subsidiary of Securitas AB. Pinkerton's business insignia was a wide open eye with the caption "We never sleep." As the US
Dirk Gently's Holistic Detective Agency Dirk Gently's Holistic Detective Agency Dirk Gently's Holistic Detective Agency is a humorous detective novel by English writer Douglas Adams, first published in 1987. It is described by the author on its cover as a "thumping good detective-ghost-horror-who dunnit-time travel-romantic-musical-comedy-epic". The book was followed by a sequel, "The Long Dark Tea-Time of the Soul". The only recurring major characters are the eponymous Dirk Gently, his secretary Janice Pearce and Sergeant Gilks. Adams also began work on another novel, "The Salmon of Doubt", with the intention of publishing it as the third book in the series, but died before completing it.