哥本哈根的深夜街頭，一宗宗詭異的謀殺案讓市民人心惶惶，根據證人表示，每次謀殺案發生之前，總會聽到奇妙優美的詠歎調歌聲，警方也因此鎖定女歌手為主要嫌犯，直到女伶的魔術師前夫突然出現，一切才開始水落石出…。丹麥首部結合黑色電影與驚悚類型的影片，1944年問世時，掀起了一陣懸疑旋風，《看誰在尖叫》丹麥導演歐波奈戴爾更宣稱受本片影響極深。 A murderer has night-time Copenhagen in his– or is it her? – thrall. Each time a strangled victim is found, witnesses describe hearing a strangely high-pitched voice singing a French chanson. Cabaret artist Odette sings precisely this 'Murder Melody' in her act, which is why the police suspect her of being involved in the gruesome ritual murders. But when Odette's ex-husband, hypnotist Valdini, turns up after many years, the case is solved...