L'Inconnue de Hong-Kong

Federal agent Alexandra Barnes believes that Catherine Petersen is a serial killer who marries rich men and then murders them for their money. But since Catherine is seemingly a master of disguise and has multiple identities, Alexandra can't prove anything with conventional detective work. With no other option, she goes undercover, pursuing the same man as Catherine, and hoping that Catherine will slip up and reveal her true identity.

Paris, December. A conductor of a choir is found mysteriously murdered, with burst eardrums. Lionel Kasdan, a police inspertor the verge of retirement, and Frank Salek, an official of Interpol, embark together on a hunt for the killer, and also to a secret organization specializing in kidnapping children.

A ruthless gang led by private detective Joseph Plender is extorting rich people and famous fashion photographer Vincent Mandel seems the next victim. He is married to Hélène, daughter of one of the richest people in Europe, but not quite happily. In fact the marriage is on the brink of a divorce and a judge is deciding who will take the two children. Can Hélène take them to Germany or will they stay with Vincent? Vincent has a lot on his mind and he improvises when model Sofia Kippiani comes to his studio, but his makeup crew doesn't show up. Before he knows it, he is accused of a rape. Things go worse and worse for Vincent, he sees his entire life slipping away and, most importantly, he might lose his children. But why does his former schoolmate Joseph Plender seek contact with Vincent and even solve a nasty problem for him? Does Plender want something more than money?

Industrialist Pierre Verdier kills his mistress Jeanne Ancelin by throwing her off a train. Her husband, Ancelin, decides to take revenge on his wife's murderer, who has been acquitted by justice.

After an attack renders her blind, Ellen withdraws from the world to recover. But soon she plunges into paranoia, unable to convince anyone that her assailant has returned to terrorize her by hiding in plain sight.