The gifted girl, Tong, has a fatal illness with the symptom of aging rapidly if not using herb rain intensively. In order to survive, she has to keep her brain processing complicated information and solving mysteries, to relieve her symptoms. Li is Tongs classmate who has the best grades in Science. When he finds out Tongs secrets, he volunteers to collect mysteries. And riddles around them for Tong to consume. Since then, the detective duo has officially formed. They will be dealing with a series of bizarre mysteries, including Vanishing the Air, Elevator Dismembering Floating Body, Killing in a Sealed Room, Girl Who Rides on a Carrot, etc. Eventually, can the perspicacious girl, Tong, solve the cold case of Li's parents murder happened when Li was ten?