陈查理表面上到巴黎去旅行，其实他是有重任务在身。他被邀请到法国巴黎调查关于一个印假证卷的组织。但是他的连络人Nardi还没有遇到就已经被杀。虽然各种线索都指着一个乞丐杀死Nardi，但是陈查理觉得案中有案。案情继续复杂化，因为陈查理也被卷入关于一宗银行总经理女儿被无辜控告谋杀的案子。而被谋杀的人是总经理女儿的未婚夫。陈查理知道总经理的女儿不会杀人。所以陈查理要寻根到底。但是两宗案子是不是有联系呢？陈查理带我们一一揭开破案。

In the slums, teenager Frankie Warren hangs out with a rowdy gang who one day knock him out in a fight. In court, the boys refuse to reveal who struck the knockout blow, and all are subsequently sentenced to a reformatory, cruelly run by two corrupt guards. New deputy commissioner Mark Braden arrives determined to change things, but despite the help of Frankie's sister, Mark's reform plans -- and Frankie's future -- may be sabotaged from within.