November 1989: Aimée Leduc is in her first year of college at Paris’s preeminent medical school. She lives in a 17th-century apartment that overlooks the Seine with her father, who runs the family detective agency. But the week the Berlin Wall crumbles, so does Aimée’s life as she knows it. First, someone has sabotaged her lab work, putting her at risk of failing out of the program. Her father takes off to Berlin on a mysterious errand and asks Aimée to help out at the detective agency while he’s gone. But the case Aimée finds herself investigating --- a murder linked to a transport truck of Nazi gold that disappeared in the French countryside during the height of World War II --- has gotten under her skin.
Aimée Leduc has her work cut out for her --- running her detective agency and fighting off sleep deprivation as she tries to be a good single mother to her new bébé. The last thing she has time for now is to take on a personal investigation for a poor manouche (Gypsy) boy. But he insists his dying mother has an important secret she needs to tell Aimée concerning Aimée’s father’s unsolved murder a decade ago. How can she say no? The dying woman’s secret is even more dangerous than her son realized.
A serial rapist has been terrorizing Paris's Pigalle neighborhood, following teenage girls home and attacking them in their own houses. It is sad and frightening but has nothing to do with Private Investigator Aimée Leduc --- until Zazie, the 13-year-old daughter of the proprietor of Aimée's favorite café, disappears. The police aren't mobilizing quickly enough, and when Zazie's desperate parents approach Aimée for help, she knows she can’t say no even if she wanted to.
Yuri Volodya, a mysterious old Russian man, hires Aimée Leduc to protect a painting. By the time she gets to his Montparnasse atelier, the precious painting has already been stolen. The next day, Yuri is found tortured to death. Some very dangerous people are threatening Aimée and her co-workers, and witnesses are dropping like flies. Now Aimée has to find the painting, stop her attackers, and figure out what her long-missing mother has to do with all this.
A missing young woman, an illegal immigrant raid in progress, botched affairs of the heart, dirty policemen, the French secret service, cutting-edge science secrets and a murderer on the loose --- what has Aimée Leduc gotten herself into? And can she get herself --- and her friends --- back out of it all alive?