以真实案件为基础，采用纪实风格，借单元案串联剧情。全片紧扣声纹技术破案视角，通过对声音线索抽丝剥茧，破解单元谜案、挖掘关键信息、揭开被掩盖的真相。影片以快节奏叙事与细节铺陈，凸显声纹破案的独特魅力，既展现警察对正义的坚守，又将人物命运融入案件之中，让观众沉浸式潜入声音的世界，感受悬疑与宿命感的交织。
As Leo's replacement Thomas Chamberlain arrives Nikki investigates the murders of Rachel Freedman, shot in the head, and her little autistic son Nathan, who was poisoned. Nikki rejects policewoman Anne Burchett's theory that Rachel killed them both but is perturbed when an impostor, claiming to be Rachel's sister, visits the morgue. At the same time the disfigured corpse of Eva Liron is discovered, killed with the same poison as Nathan. She had been the nanny to French hot shot footballer Isaac Dreyfus and was planning to blackmail him over a sex tape of them both. Jewish Isaac is a controversial figure due to his anti-Muslim sentiments but he denies ant part in the murders. Then another victim, Isaac's agent Mousa, is discovered dead.
讲述了三个命运交织的人物： Naksit——遭构陷贪污的政客，被迫遁入丛林部落避世； Phawanee——刚从法国名校毕业的教师，秉持正义揭发担任镇长的叔父与私立学校的黑幕； Siwa——人前圣商、人后行贿的伪善企业家。 当Phawanee目睹愈演愈烈的腐败现象，这位倔强的女教师毅然踏上对抗社会不公的险途。屡战屡败却愈挫愈勇的她，最终说服隐匿山林的Naksit重出江湖，两人携手向盘根错节的利益集团宣战……
