No One is Innocent

Mr. CHONG CHI MAN, a Hong Kong film magnate who, after a long absence, returns to Hong Kong with plans to produce a new film. His old friends all gather around him, each hoping to benefit from Mr. CHONG's new project. Mr. CHONG arranges for a group of these friends to visit him and to spend a few days in his grand old house situated on one of the isolated island in Hong Kong. This group of friends each carries different objectives on this trip.

The visitors' voyage to the island is marked by the rescue of a young man nicknamed 'Little Sprin' who claims to be an illegal immigrant from China. He accompanies the others to the island. Upon their arrival, the visitors are treated to a banquet presided over by their host, Mr. CHONG, After dinner, MR SOO gives a demonstration of his Kung Fu prowess hoping to impress Mr. CHONG, only to be met with mockery. Angered and shamed he gets into a fight with MON LI TAN. MON, in the ensuing chaos, makes the first of many attempts to kill Mr. CHONG. Strange and sad music is often heard in the house. The source of which is soon discovered to be Mr. CHONG's daughter, CHONG HUE TUNG, playing the piano.

Not suspecting that 'Little Sprin' is actually a thief. Mr. CHONG allows him to stay behind to serve as caretaker of the old house. Meanwhile, detective PAO suspects that MON LI TAN has tried to kill Mr. CHONG and warns him of the situation. On the other hand, PAK FU YUNG, HA LUM UM and TAI MA S00 tries every way to fulfill their objective. However, this leads to confusion and a series of hilarious situations. The old house continues to have a lot of mysterious happenings culminating in the disappearance of Mr. CHONG.

The disappearance of Mr. CHONG leads 'Little Sprin' to suspect several of the visitors of having done away with Mr. CHONG after failing to obtain favors from him. However, detective PAO suspects there may be more behind the story. CHONG's daughter, HUE TUNG, recounts that she had been knocked unconscious while talking to her father the night before he disappears. 'Little Sprin' who was eavesdropping under the bed is also rendered unconscious. Regaining consciousness, they discover Mr. CHONG's disappearance. A tape recording of Mr. CHONG's voice is accidentally found by PAK FU YUNG under her pillow. He asks her to endeavor to find him. KIU KAM FA learns of the tape recording and insists in participating in the search. The visitors all discover that one door in each of their room leads to the basement which they proceed to search. However, no trace of Mr. CHONG is found……

The strange sound and the mysterious happenings continues to occur in the house. The group finally decides to investigate into this matter and Mr. CHONG's son, TING SIN, is elected to lead and direct the operation. Mean- while, MON LI TAN discovers that TING SIN is actually a schizophrenics. He informs everybody but nobody believes. The group even assist TING SIN in locking MON in the basement.

KIU KAM FA, hypnotized by CHONG's lawyer - YEUNG, leads the group to believe that she is possessed by CHONG's spirit. Everybody is fooled with the exception of Detective PAO who plans to investigate. In the mean- time, CHONG's son, TING SIN, has turned schizophrenic and altered personalities. He traps a member of the group in the basement and proceeds to torture them. However, MON arrives, in the nick of time, to save the victims but is not quick enough to defuse a bomb planted by TING SIN. The explosion causes much damage to the room but luckily nobody is hurt. In the meantime, PAK FU YUNG disappears and MON, fearing that TING SIN might harm her, locks TING SIN in the basement. The film siren, LAM LAM, discovers a boat anchored near the island, everybody packs to leave only to discover that the boat malfunctions……

TING SIN, under guard in the basement, manages to overcome his guard and escape. Mr. CHONG , who is alive, is actually living in a cottage where he has brought SIU SIU under the mistaken impression that she is his love, PAK FU YUNG, At this stage, SIU SIU has no choice but to Mr. CHONG, she is only disguising as her mother, PAK FU YUNG. In the meantime, several of the man attempt to repair the boat, leaving KAM FA and PAK FU YUNG ashore. The two are soon captured by TING SIN but manage to escape. PAK FU YUNG and KAM FA then go to Mr. CHONG's room to search for SIU SIU, However, PAK FU YUNG suddenly disappears and SIU SIU reappears.

Together at last, Mr. CHONG and PAK FU YUNG prepare to leave the island but are caught by 'Little Sprin' and his two uncles. The three held him for $10,000,000 ransom. Mr. CHONG informs them that the key to the safe is in the possession of his lawyer, YEUNG. 'Little Sprin' attempts to trick lawyer YEUNG into giving him the key but arouses the lawyer's suspicious and calls for help. Detective PAO and MON answer YEUNG's call of distress, overpower 'Little Sprin' and lock him in the basement. The safe is opened by lawyer YEUNG in everybody's presence. The sight of the contents overwhelm KAM FA and TAI MA S00 with greed.

Lawyer YEUNG hears notices coming from Mr. CHONG's room at night and proceeds to investigate, opening the safe to check its contents. However, TING SIN suddenly appears and overcomes her. Meanwhile, KAM FA sneaks into Mr. CHONG's room to find the safe wide opened, she then proceeds to take the money out. HA LAM LAM and SIU SIU discover KAM FA's absence and fearing her safety, they begin to search for her and find her in front of the safe. UM FA asks that they allow her to take some of the money from the safe, and in pity, they let her. The remaining money in the safe was shared amongst the other members of the group. In the meantime, 'Little Sprin's' two uncles are looking for him but are discover by Mr. CHONG's housekeeper, LUCY and locks them in the basement.