Boire tries to run Camille off the road, but she manages to visit her father Philippe in prison. Camille and Lea are ordered to babysit arms-dealer and billionaire Leo Duval at The Majestic. Duval has been facing death threats, and it is rumored that the legendary assassin Nightshade is hired to kill him. Problem is that the Nightshade hasn't been seen for fifteen years. Harry acts as the guide and encyclopedia trying to stop the assassin, something that brings Camille and Harry closer. When the dead body of a former MI6 operative shows up, Camille realizes the Nightshade is still alive. The riddle gets even more complex as the night closes in. There are stronger motives than money.

During the Cannes film festival, Camille and Lea are assigned a murder case of famous actress Celeste Badeau's assistant Zina. Was the movie star the intended target? The prime suspect is the notorious paparazzi Miko Zajac blackmailing Celeste, but why? During the investigation Lea meets Zina's girlfriend and Lea's former lover Eloise, and Camille sees that it affects her. Meanwhile Harry's daughter Emilie has been threatened by Boire, and he decides to stop the thug once and for all. Harry breaks into Boire's office and finds alarming evidence that will shock Camille. Her father Philippe is about to be released, and Harry has to walk a fine line trying to protect Camille from ending up in the line of fire.