Lucien is a dwarf, who works hard in a large legal office. His only friend is trapeze circus artist Isis. One day he gets the attention of singer Paola Bendoni and falls in love with her.

In the course of a violent hold-up at Deauville station, several innocent bystanders are shot dead. The victims include a politician, Robert Andréani, and three members of the same family. Devastated by the death of his wife, daughter and mother, Martin Modot resolves that their killers will be brought to justice. When the police fail to make any progress in their investigation, he decides to take matters into his own hands, with the support of a neo-fascist vigilante organization.

When the investigation on a prostitute murder by the Paris vice department derails, one cop will stop at nothing for revenge.