London.
Jack the Ripper is the name given to an unidentified serial killer who was active in the Whitechapel district of London, England, in 1888. The killer was responsible for the brutal murders of at least five women, all of whom were prostitutes. The identity of the killer has never been conclusively established and the case remains one of the most famous unsolved mysteries in history. The Ripper's modus operandi involved cutting the throats of his victims and mutilating their bodies in a gruesome manner. The killer's notoriety has spawned numerous books, films, and documentaries.