The secretary Liza Raines becomes deaf after a shooting in a robbery, is evicted and later she is found by the social assistant Grant Kane living in her car. Grant brings Liza to a Transition Shelter to be rehabilitated, and she accepts to be submitted to an experimental treatment never tested in humans in the Center for Hearing Research. The leader of the research Dr. Gene Kramer is pressed by the CIA agent Aiden Porter that is funding his experiment to test his vaccine of restoration of cells in fifteen patients, and he advises that the rats subjected to the experiment became psychotic. The patients also become psychotic and suicidal, with the exception of Liza, the patient 14. She achieves the ability of hearing frequencies emitted by the brain and read minds as a side effect. Porter recruits Liza to work in CIA disclosing the innermost thoughts of the suspects, but later Liza finds his real hidden intentions. 很繁琐的思考分支。脑电磁波传导，若是这样……。间谍是怎样炼成的。 为了恢复听觉，十五名聋患者参加一项实验性临床计划。可其中十四名参加者在试验期间成为 严重的精神病患者, 最后为停止治疗带的严重副作用，他们被杀死。本片是关于实验中唯一生存者, 14号病人 Liza Raines的故事。她得到了超级听力——尤其是她能够听到人们思想时所发出的频率。
