Crossing Baker Street

London, the Age of Fog, 1987, the roar of steam entangled over the Thames River, and the gas lamps cut the streets into dim pieces. Lin Yuan woke up and found himself huddled outside the cellar door of No. 219 And a half Baker Street, with the bitter almond smell of cyanide still lingering in his throat - that was the last memory of the modern criminal investigation laboratory. He has no identity, only a navy blue windbreaker, a fingerprint brush soaked in blood, and a fragmented impression of the Sherlock Holmes legend: He knows the end of "A Scandal in Bohemia", but can't remember where the photo went. Goldfinger comes with nightmares: he can use ammonium chloride to restore old bloodstains, can use psychological statistical models to profile suspects, and even remembers the "established trajectory" of the London serial dismemberment case in the history books. But the times immediately taught him a lesson: with his short hair, atheism, and tone of questioning the Queen, he was reported by his neighbors as a "remnant of the French Revolution"; Scotland Yard almost mistook him for an Irish bomber. Life became the first mystery. Deep in the fog, a hand wearing black leather gloves handed over an old envelope: inside was a photo of the "Pattern of First Blood", and the date was actually a week later. The sender signed the letter "Veronica H", but the handwriting closely matched Lin Yuan's own right hand. At the same time, Holmes secretly stared at him and regarded him as "a variable that breaks the established destiny." Lin Yuan must walk a line of reasoning that no one has written for him between maintaining the integrity of history, avoiding the butterfly storm, and saving the nameless girl who is about to be disemboweled. What's even more frightening is that he suspects that he is the "future copycat" who has left his fingerprints in the shadow of history. A new story is about to begin