私家侦探马克·斯宾西里（毛里齐奥·梅里饰）在调查一起失踪事件时，发现了一个可疑的国际组织的存在。
In the city of Milan, a brutal gang of thieves rob a jewelry shop and just manage to escape capture by the police. During the robbery one of the gang members is severely wounded and needs medical attention immediately. The thieves discover a prominent surgeon (Anthony Steffen) lives nearby, so they bust their way into his house and force the doctor to aid the wounded gangster.
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