Evelyn Hayes, a successful businesswoman, is about to marry into a wealthy family and become the daughter-in-law of the powerful General Anu. Her three best friends throw her a bachelorette party at a themed hotel. In the middle of the night, Evelyn Hayes is found dead in the bathtub of her bedroom, with a dagger in her chest. Who killed Evelyn Hayes? General Anu sends the two neurotic detectives Nan Ke and Jin Tian Er to find the killer. The three friends each harbor ulterior motives and accuse each other of being the murderer. The neurotic detectives gradually unravel the mystery of Evelyn Hayes's murder through their individual memories of the bachelorette party, but after closing the case, the two discover that there is another truth behind the case...