Su Jianwei transmigrates into the body of a disgraced minister's daughter, demoted to serve as a coroner. Coroners are lowly servants, and anyone can push them around. But Su Jianwei has a golden finger: when her palm touches a corpse, she can see the dead person's final three seconds of memories.
A wealthy merchant's son who dies on his wedding night, an embroiderer pulled from a pond, a courier carrying silver who was buried alive... What others call "accidents," Su Jianwei can see through with a single touch.
The Jingzhao Prefecture judge gives her a hard time? She fires back with three pieces of evidence. An assistant minister at the Court of Judicial Review trips her up? She brings the Demon-Suppression Bureau and turns the tables. The Empress Dowager sends poisoned pastries? She feeds them to a dog. When it dies, Su Jianwei carries its corpse into court.
Xiao Jue only wanted to hire a cheap coroner to get the job done. Then he discovers that this coroner can do more than her work: she can take down half the imperial court. He tosses her a waist token. "From now on, work for me." Su Jianwei replies, "I can work for you, but don't get in the way of my autopsies." Xiao Jue is silent for three seconds. "...Fine."