Reporter Yu Mong-yuen is recovering from a leg injury in his fiancee Man-wah's apartment. Bored, he looks out the rear window and observes the life of the neighbouring building. Among the tenants are a sugar-daddy and his mistress, a middle-aged man wants to marry a young girl, but she is in love with his son. Finally, she hatches a plot and makes the man agree to her marrying his son ; a sly fortune-teller ; a lively gym, a rich widow quarrels with the trainer of a gymnasium because his dog has bitten her cat ; and an opera school, a woman signs, leaning on the balcony, and a man tries to strangle her. In fact they are rehearsing an opera…… One evening, Wah is on the night shift, and Yuen watches the opera troupe rehearse to the end. Under the influence of drugs, Yu mistakenly believes that a divorced man has murdered a taxi dancer. He alerts the police, but the whole thing is nothing more than a misunderstanding.

The Prime Minister's daughter, Kong Yeuk-mui, is attracted by the private tutor, Chow Yuk-pui. However, the Prime Minister despises Pui's lowly background and banishes him. Kong disowns her father, hoping to marry Pui when he achieves honours in the imperial exam. Meanwhile, Mui's brother Tak-chu prepares for the exam under Pui's tutorship. Pui and Chu, take the money Mui gives them and head for the capital. Unfortunately, Pui has himself fallen ill. Considering that the examination day is approaching, he gives all the travel expenses to Chu and urges him to set off. Mui resides at Loquat Alley, longing for Pui's honourable return. One day, she comes across a beggar, when she recognises it is Pui, her heart breaks. Chu who has newly been appointed Top Scholar, arrives and tells her sister the whole story. Nevertheless, Pui's sister is chosen to be the imperial concubine. Benefiting from this bond, Pui becomes the Royal Brother and works as the court secretary and weds Mui.

Fok Tats scheme to raid a convoy of government reserve is intercepted by 'Ghost Knight'. Chau Ping, an accomplice of a corrupt official, declares wars on Fok whom he believes has ties with the mysterious raider. A meeting was convened by Ghost Knight to settle the dispute. Tat's son Sze-chuen learnt that his maid Ma Yuk-lan is the daughter of a general of the ousted Ming court who has donned the mask of a knight-errant to protect the son of the Ming minister Sze Ho-fat, Sze-chuen himself. Back in Deadly Valley, an impostor of Ghost Knight was caught. Slashing at the father, Sze-chuen is disheartened to learn that the faker, Ma's mother, has been transferred to the enemy camp in a feigned surrender orchestrated by Sze while an uprising is gathering momentum funded with money robbed from the corrupt official. Ma teams up with the father and son to storm the Chau Fortress and rescue Ma's mother. The couple champions the restoration of the old empire with Sze's seal.

HK horror film.