Detective Petch receives an assignment of investigating a murder case. The only evidence he has is a recording of a woman moaning while having sex. There are 3 suspects; May, a prostitute, Daeng, a hairdresser and Ploy, his own wife. He must have sex with all 3 women in order to find out who’s the owner of the voice in the recording. But the truth turns out to be not what he expected.佩奇侦探接到一项调查谋杀案的任务他所掌握的唯一证据是一个女人在做爱时呻吟的录音。犯罪嫌疑人3人;梅，一个妓女，邓，一个理发师和计策，他自己的妻子。他必须和所有的3个女人发生性关系，才能找出谁是录音的主人。但事实并非他所预料的那样。