Falco and his team face a killer who poisoned several women, they have to stop him before he makes any more victims. Who is behind this disturbing M.O ? Are the victims as random as they seem ? Furthermore, the awakening of Falco jeopardizes Carole's couple, his wife. Will she choose to resume their relationship ? How will Chéron react?

While the DPJ is entrusted to a new Commissioner, replacement of Menard Romain disappeared ... Falco receives a video showing him tied and shackled in kilograms of explosives. It serves as a lever to push Falco to help a prisoner escape to local IGS. The policeman began by refusing, but the kidnapper, a woman, extirpated by force Romain enough to tip the balance: Pauline and Carole. While Falco accepts blackmail, Eva investigate the man who has to escape, Alban Dauzier and seeks to identify and locate the woman who kidnapped Roman. The escape attempt was cut short and turns into hostage. Falco manages to get by, but ends up with its own DPJ and the IGS in pursuit. Isolated, it can only rely on itself to achieve save Romain.

A sixty year old woman is brutally attacked and left almost dead in the street in broad daylight. His fingers were broken to make him confess something ... but she refuses to say what. It's just something binds to a murder that took place a week earlier in similar circumstances. Grenier, an obstetrician who worked with inmates was also tortured. The puzzle is completed as and as Falco and his crew discover the key elements. A women's prison. Birth under X. detained victims of lies ... and a killer in search of a child that her mother would have never wanted to give up.