Paris, July 1999. Private investigator Aimee Leduc is walking through Saint-Germain when she is accosted by Suzanne Lesage, a Brigade Criminelle agent on an elite counterterrorism squad. Suzanne has just returned from the former Yugoslavia, where she was hunting down dangerous war criminals. Back in Paris, Suzanne is convinced she's being stalked by a ghost - a Serbian warlord she thought she'd killed. She's suffering from PTSD, and her boss thinks she's imagining things.

Parisian private investigator Aimée Leduc is about to go onstage to deliver the keynote address at a tech conference that is sure to secure Leduc Detective some much-needed business contracts when she gets an emergency phone call from her daughter’s playgroup: Aimée’s own mother, who was supposed to pick Chloe up, never showed. Abandoning her hard-won speaking gig, Aimée rushes to get Chloe. But as Aimée and Chloe are leaving the playground, Aimée witnesses the body of a homeless woman being wheeled away. The last person anyone saw the woman talking to was Aimée’s mother.

Tension runs high in this working-class neighborhood as a hunger strike to protest strict immigration laws escalates among the Algerian immigrants. Aimée barely escapes death in a car bombing in this tale of terrorism and greed in the shadows of Paris.

Bruno Courreges is chief of police of the lovely town of St Denis in the Dordogne. His main wish is to keep the local people safe and his town free from crime. But crime has a way of finding its way to him. For 30 years, Bruno's boss, Chief of Detectives Jalipeau, known as J-J, has been obsessed with his first case. It was never solved and Bruno knows that this failure continues to haunt J-J. A young male body was found in the woods near St Denis and never identified. For all these years, -J has kept the skull as a reminder. He calls him 'Oscar'.

Kate Rees, a young American markswoman, has been recruited by British intelligence to drop into Paris with a dangerous assignment: assassinate the Fuhrer. Wrecked by grief after a Luftwaffe bombing killed her husband and infant daughter, she is armed with a rifle, a vendetta, and a fierce resolve. But other than rushed and rudimentary instruction, she has no formal spy training. Thrust into the red-hot center of the war, a country girl from rural Oregon finds herself holding the fate of the world in her hands.