Xavier Lombard is a Parisian private detective based in London. His best friend is Nathalie, a high-class call girl. He gets a telephone call from an old friend in the Paris police department, now a businessman whose brother-in-law is missing. The missing man's parents hire Xavier over their daughter's objections, and he quickly finds himself caught up in the underworld of child sex slavery. He guesses that the lost son is dead and shifts his focus to finding and breaking this lucrative business of child trafficking. He gets a reluctant Nathalie to hunt "the Austrian", the shadowy head of the business. Violence erupts quickly, and Xavier soon has little more to lose.