Who knows! Something strange happened when I came home from vacation! My best friend returned home early but smelled weird, got angry at me for no reason, ate half of her meal and disappeared into a dark alley where she was doing some errands! I went to pay homage to the deceased old lady Zhang with my mother. When I was lighting incense, the incense suddenly went out. After it was rekindled, a gust of evil wind blew, and the incense in my hand turned into sticky black stuff. The man next to me screamed in fright! Turning around, I saw my best friend huddled behind the altar table, with empty eyes and a wide grin, asking for "something" - what deadly secret is hidden in this summer vacation in the old city?