在这部汉欧威广场犯罪/剧情/恐怖片中,乔治·哈维·博恩（拉尔德·克雷加 饰）是位出色的英国作曲家，由于长时间的工作压力，他经常会进入一种奇怪的失神状态，一旦听到不和谐的噪音就会失去意识，无法控制自己的所作所为，等重新恢复意识后则会忘记自己在失神状态下做过什么。有一次，他失去了整整一天的记忆，某些迹象令他怀疑自己在失神状态下杀了人，于是他去警察厅向医生艾伦·米德尔顿（乔治·桑德斯 饰）进行咨询，医生并没有发现可以证明他杀人的证据，同时劝他平日放轻松，不要一直沉浸在音乐的世界里，多享受一些平常人的娱乐活动。他听从医生的建议，到一个小酒馆去听歌女内特·朗顿（琳达·达内尔 饰）唱歌。内特是个拥有狼子野心的女歌手，一心想要出人头地，知道乔治是作曲家后，开始不断利用他为自己作曲，乔治在这过程中越陷越深，最终向内特求婚，不料却发现内特早已答应了别人的求婚。愤怒不已的乔治回到家中后，无意间受到一阵小提琴噪音的刺激，陷入失神状态的他拿起杀人工具，开始渐渐向内特家走去。
George Harvey Bone is a composer in early 20th century London, who is under stress because he is writing a piano concerto. Due to this stress, he gets black outs when ever he hears dissonances. When he finds himself after the black out in a different quarter of the town, he returns home, to read in the paper that somebody in that quarter was murdered. Asking help from a doctor at Scotland Yard he is assured that he has nothing to do with it, but he is advised to cut back in his work and get some relaxation like other, ordinary people. At a cheap musical he meets Netta, a singer, who inspires him for a new motive for his concerto. But Netta discovers that this motive could also be used as a song for her. The song gets sold, and she hangs around George to get more songs out of him. George believes that Netta is in love with him, and gets in an argument with his girlfriend Barbara, the daughter of Lord Henry, who wants the concerto for one of his soirées. George has another black out, ...
