警方ComissionerDatti正在调查一名女医生的凶手似乎是一个三十fivish岁的男子被谋杀。不久，另一个谋杀如下：钢琴家罗伯特Dominici的女友被发现死亡。杀手也挑战Datti在手机上，并说他不能被捕获，因为他有一个秘密，这使得他刀枪不入。在此期间，线索似乎指向奇怪的方向...
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