鄭光輝是專挖人瘡疤並加以斂財的私家偵探。他的舊情人黛玉，是「台一製鋼」董事長秘書，也是個私人關係複雜的危險女子。在光輝收集證據恐嚇舊情人的過程中，也一併收集了其他相關人物見不得光的小秘密。某夜，光輝突然瓦斯中毒身亡，警方開始介入調查，抽絲剝繭下，當晚在光輝公寓附近曾出現五個嫌疑犯，但他們皆有不在場證明。正當一籌莫展之際，找到了第六個嫌疑犯。

繼《五月十三傷心夜》（1965）大獲成功後，林摶秋率領原班人馬改編日本電影，推出充滿外遇、金錢糾紛與情殺的推理偵探片。電影完成後，他卻越看越不滿意，而未曾上映。然而，摩登男女錯綜複雜的人際關係，與層層轉出的精彩敘事，至今看來仍不落俗套。片中，角色個性設定、造型、道具、表演方式皆十分講究。結合充滿空間細節的室內搭景、高反差光影與輕快的爵士音樂，使1960年代的台北搖身一變成了充滿資產階級、迷人情調的現代都會。

TENN Kong-Hui is a private detective who uses people's shady pasts to blackmail them. Tai-Giok is a secretary to a steel company's chairman, and a dangerous character. When she and Kong-Hui break up, he begins collecting evidence against her, and in the process unearths the dirty secrets of the people associated with her. One day, Kong-Hui is found dead in his apartment. There are five suspects but all of them have alibis. Just when the police seem to have hit a dead end, a sixth suspect emerges...

After the success of May 13th, Night of Sorrow (1965), LIN Tuan-Chiu adapted a Japanese film into this gripping detective mystery of love affairs, greed and murder However, LIN was not satisfied with the finished film, so it never received a theatrical release. But its' complicated relationships in a modern society, and its riveting plot twists, still resonate today. All aspects from the characters, performances, costume and makeup to production design is well-executed, and the elaborate interior sets, expressionistic lighting and smooth jazz soundtrack turn 1960's Taipei into an exciting, bourgeois metropolis.