When Lin Wan was sorting out her grandfather's belongings, she found a letter from her aunt Lin Pei at the bottom of a camphor wood box in the attic of her old house. The envelope contained suspected blood stains. The letter stated that her aunt did not accidentally fall into the water, but was murdered. After that, Lin Wan started to explore the truth. She found Officer Zhou who was in charge of the case, but failed to obtain any effective information. She also learned from her neighbor that the key witness, Aunt Wang, had inexplicably moved away after her aunt's "accident". Following the clues, Lin Wan found her aunt's lover Chen Yuan, who has been pursuing the truth for many years. At the same time, her grandfather's diary and the appearance of a mysterious lawyer made the case more complicated and confusing. Lin Wan was determined to uncover the cruel truth hidden in the old house and the past.
