London, late-1800s. Sherlock Holmes is a consulting detective, using his powers of observation and deduction and vast knowledge on anything relevant to solve mysteries, including crimes. Cases that would stump most other detectives are short work for him. He is ably assisted by his friend Dr Watson
After a Qing-dynasty gold crown vanishes from a stone coffin, obsessed detective Yang Lianian and his irreverent rookie partner Liu Peanut uncover a chilling ritual: the crown adorns an "amber-encased female corpse" bearing a lotus sketch, exposing a hidden cult exploiting modern emotional vulnerabilities through layered superstition schemes.
The police chief, Detective Ding, and a wealthy local businessman, Feng Da Tou, collaborate with a foreigner and traitor to sell opium for their own selfish interests. A female detective, Huo Qing, arrives in Pujiang Town with her assistant, Yan Er, and has many misunderstandings with the deputy police chief, Xing Yi, as they investigate a case.
Chiharu has supported her husband Tsukasa for years, working multiple jobs while he trained to become a psychiatrist. Now over 30 and struggling with infertility, she discovers Tsukasa has impregnated another woman—and despite a divorce settlement, Chiharu is determined to win him back.
Lumina Wong lives alone, works too much and feels as if life is passing her by. Late one night she meets a mysterious man in the mirror and they fall in love.
The story of this series revolves around a young girl named "Hojan", an Iranian elite and inventor of an important product that was previously imported from abroad. He succeeds in producing this product, making Iran free from the need to import it. But some profiteers who have interests in importing this product are plotting against him. They try to prevent the mass production of this invention and even reach the point where they plan to physically eliminate him. Later, the police get involved to protect "Hojan" and confront the criminal gang.
While investigating a murder in the old city, Public Security investigator Song Xingye uncovers a hidden conspiracy. Teaming up with his tech-savvy assistant Zhen Na, tough police officer Shang Wei, and the mysterious heiress Zhao Qingyun, he races against time to expose the truth and stop a looming coup.