A detective job involves solving cases, which requires a lot of legwork. The term 'CASE' is used to refer to an individual investigation, while 'cases' is used to refer to multiple investigations. Two famous fictional detectives are Sherlock Holmes and Detective Chan, who was created by Earl Derr Biggers and featured in the novel 'The House Without a Key'. His full name is Charlie Chan, and his sidekick is named Jimmy 'ALLAN' Fyfe.