This is a film based on the true British event "Jack the Ripper".
At the beginning of the film, the scene of imitating the style of 19th-century London is a bit fake, and the difficult living conditions of women and the dirty streets are very realistic.
JD plays a detective in the area under his jurisdiction, where the brutal murder of prostitutes occurs. Each victim will be dismembered after death, and the murderer will deliberately keep a certain body part of the deceased.
Combining the grapes that appeared at the crime scene (equivalent to Chanel in the fruit at the time), professional tools for committing crimes and skilled techniques, it was finally deduced that the murderer was a nobleman who had worked as a doctor. All this is actually because the prince fell in love with a prostitute and had flesh and blood, and the royal family wanted to cover up the scandal... insiders.
During the investigation, the detective falls in love with a kind prostitute. In order to protect the prince's flesh and blood, the detective let the girl and child leave London, and then went to find them. But in order to keep this secret and for the safety of the girl, the detective never met them.
Best of all, it's a coincidence that as soon as the detective in the movie falls asleep (by smoking opium), a clip related to the case comes to his mind. In reality, Samuel Taylor Coleridge also smoked opium, and claimed that he dreamed of his long poem Kubla Khan when he was asleep.
The detective spent the rest of his life smoking opium, presumably because he wanted to escape the real world of sin, and in his dreams he could see the girl he cared about.
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