The suspense writer Su Ran never thought that two anonymous letters from his ancestral home in the mountains would completely reveal his family's centuries-old secrets - the familiar writing style of "Su" on the letter paper, the "house-guarding fox" totem that his grandmother never mentioned during her lifetime, and the truth about the mysterious disappearance of his uncle Su Ming twenty years ago, all pointed to the abandoned village called "Sujia'ao" and the old brick house deep in the village that concealed the "forbidden place".
One letter urged him to return home before July 15th to "quell evil spirits", while another warned him that "the ancestral home is a prison, do not enter it"; the "mudslide" recorded in the county annals was actually "the forest died overnight", the "Su Ming murder case" that the guide Uncle Li kept secret, and the mahogany wardrobe in the west wing that was strictly forbidden to be touched, all revealed suffocating weirdness.
In order to find the truth behind her grandma's lies, Su Ran and her assistant Lin Yue went into the mountains. The deathly silence of the village locked in dense fog, the vermilion door of the ancestral home that opens and closes automatically, the confusing voices imitating relatives in the middle of the night, the footprints of children appearing out of thin air in the dust, and the ancient prophecies of "Essence is the object" in "The Book of Changes" and "The fox in Qingqiu deceives people" in "The Book of Mountains and Seas" drag them into a dangerous chess game against time - is it a guardian destined by blood, or a trap set by evil things? When the copper key touched the seal of the ancestral home, Su Ran realized that what he had to face was never a "fox", but an obsession hidden deep in the heart that was more terrifying than ghosts.
