Three years after Vanished by the Lake, Lise and Clovis are now by another lake, in Annecy, and face the challenge of a new family life with their nine-month-old son Tom as the couple takes on a demanding new investigation.

A serial killer, nicknamed 'La Mante' decides to collaborate with the police when a string of murders that copycat her style suddenly appear.

When her daughter Julie disappears in the Underground Levels Under City of Paris without leaving a trace, Catherine Suzini is convinced that she alone can find it. Former cop, retired as well as drifting, she will have to resolve to team up with Raphael, the teammate of his daughter. Together, they will leave the surface and sink into the depths of Paris to embark on a terrifying and frenzied race to the descent into hell .

The story of a French president to be and one of his friends, the mayor of a small city in northern France.