真相，從來有如打不開的門。門的另一端，總藏著不可告人的秘密。復⼯不久的社⼯收到新個案，探訪懷疑不慎誤按家中平安鐘的獨居老人。當她看見應門的老伯臉有瘀傷，隨即認定發生潛在虐⽼個案。社工鍥而不捨希望了解老伯的所有，老伯卻毫不領情把她趕⾛。連串離奇事件隨之而來，不斷挑戰社工的既有想法。究竟眼見才是真，還是眼不見方為實？在晦暗的虛實遊走，尋到的還是看不見的答案。

Ms Chan, a social worker who has just returned to work, receives her first case. She pays a visit to Jia, a single elderly who seems to have accidentally dialled the Care-on-Call Service. Jia has suspicious bruises on his face and Ms. Chan senses a possible family abuse situation. However, Jia’s attitude is unwelcoming and he sends her off right away. Since then, a series of peculiar events make Ms. Chan question her own sense of reality and sanity.