Isabelle witnesses the murder of her brother Marc and his wife. She takes refuge with David, a friend of Marc. He works in the IT department of the police. David discovers that Marc was involved in a secret political organization.

Isabelle helplessly witnesses the murders of her brother and her sister-in-law. Murdered by killers belonging to a mysterious movement, she becomes their new prey. She takes refuge with David, an official of the Ministry of the Interior. Wanting to protect Isabelle, David is caught in a whirlwind of murders, events, prosecutions and complications in an unknown, unusual and new Paris. David will now be tracked down by killers of whom he no longer knows if they belong to the middle, or if they are his own colleagues. He will try to conduct his own investigation and will fight to the end to conquer the truth and unconsciously the love of Isabelle.