麗娜(張清清)、淑清(陳雲卿)兩姊妹相依為命,麗娜在歌廳駐唱,賺錢讓淑清完成學業。淑清並沒有因此感激,反而以姊姊的職業為恥,也不願意讓藥廠的同事來家裡拜訪。淑清喜歡公司的主任廖文彬,但文彬卻對有過一面之緣的麗娜傾心。麗娜和文彬交往,讓追求麗娜的鄭豐源很不是滋味,甚至找人圍毆文彬。為了擺脫鄭豐源的糾纏,麗娜辭掉歌廳工作,但鄭豐源卻找上門用言語輕薄麗娜,讓淑清誤會姊姊是不三不四的女人。鄭豐源的女友明珠(張美鳳)心生忌妒,登報毀謗麗娜到處勾搭男人。5月13日這一天,麗娜請文彬到家裡用餐,順便介紹給淑清認識。淑清此時才發現姊姊的男友竟是自己的心上人,大受打擊,責怪姊姊破壞自己的幸福。淑清在風雨交加的夜晚離家出走,碰巧遇上鄭豐源,鄭豐源趁機將她灌醉帶到飯店,再打電話威脅麗娜。麗娜趕到房間卻驚見鄭豐源遭人刺死,一旁的淑清不醒人事,手上還握著兇刀,警方抵達現場後立即將兩姊妹逮捕。麗娜愛妹心切,坦承殺人,誰知明珠卻主動出面自首。原來當晚見到鄭豐源色迷心竅想對淑清下手,明珠氣憤難耐,拿起水果刀將鄭豐源刺死。真相大白,淑清感謝姊姊的犧牲奉獻,兩姊妹合好如初,麗娜與文彬終於情人終成眷屬。
After the death of their mother, Siok-hui sings in a nightclub to support her younger sister Siok-tshing, but her immature sister looks down on her occupation. Siok-tshing then begins working in a pharmaceutical company where she has a crush on her colleague Bun-pin. But little does she know that Bun-pin has fallen passionately in love with her sister. When she finally discovers the truth, she runs away and drowns her sorrows at a bar. There, a lascivious businessman who stalks her sister forces here to go with him to a hotel. Siok-hui rushes to the hotel, where she finds the man lying in a pool of blood...
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