A bizarre serial murder case takes place in Luzhou City. The victims are all young female violinists. There are no signs of sexual assault, and their hearts have all been removed. At the crime scenes, Detective Captain Cheng Fei finds no useful clues. The murder weapon is suspected to be a medical scalpel. The only witness saw a gray car at one of the scenes. After painstakingly piecing together the clues, the police identify three suspects: surgeon Lou Ziqiang, private clinic doctor Ma Youxin, and psychology clinic owner Du Liqun. But none of them is the real killer. Just when all hope seems lost, a little boy helps Cheng Fei. Everyone calls him Mai Zi. Mai Zi has an astonishing sixth sense and extrasensory abilities, as well as the ability to rearrange memories in the subconscious. Cheng Fei is affected by his powers, and he and Mai Zi form a mysterious connection in their dreams. At last, through this miraculous bond, they solve the bizarre murder case that has remained open for five years.