A murder takes place at the Shen family villa. Shen Niantang turns herself in, claiming she strangled her younger sister, Shen Nianwei. But surveillance footage the next day shows that Shen Nianwei was still alive when the crime occurred, and that the killer was her own twin sister. Plunged into self-doubt, Shen Niantang is forced to join forces with criminal police officer He Huaizhou to investigate, and they discover that her sister is not dead. The mystery of the twins’ identities, a baby swap twenty years ago, and bloodstains hidden in the housekeeper’s will push the sisters toward the truth about their father’s murder. When Shen Nianwei appears again, she is holding half a photograph, the only evidence from the scene of their mother’s death.
