Umut, a young man who is mute but not deaf, finds out that his mother has been meeting with a stranger.

　　Umut, a young man who is mute but not deaf, finds out that his mother has been meeting with a stranger.

　　位于以色列首都特拉维夫附近的科学发展研究所，最近研发成功一种剧毒，它跟水结合后产生的毒气，能在瞬间取人性命；为了解这项发展成果，一群美国专