在这部唱歌神探喜剧/犯罪/歌舞片中,一名侦探小说作家（Robert Downey Jr. 饰）躺在医院病榻上构思新作情节：一名愤世嫉俗的私家侦探一到夜晚摇身一变成为乐团主唱歌手，故事主人翁被卷入1950年代洛杉矶一宗妓女凶杀案……随着病情加剧，他渐渐无法分辨故事与现实，精神状态陷入疯狂边缘……
"While hospitalized with an extreme case of psoriasis, novelist Dan Dark reworks his first book in his head. Feverish, paranoid and prone to musical outbreaks, he confuses himself with his protagonist, a detective investigating the murder of a prostitute in 1950s Los Angeles."
“唱歌”不“神探”。每个人的心里都住着一个受伤的小孩。《唱歌神探》故事梗概。
