Bolzano, Southern Tyrol. Though part of Italy, many speak German here. Its a city with two faces. On one side, those of German heritage - precise, rigorous, and well off. On the other, Italians - loud and passionate. But both sides are equally shaken when a ruthless serial killer comes back, targeting German-speaking victims. He has been active years ago, when Paolo, an Italian police inspector, lost a leg and his girlfriend trying to catch the "Monster of Bolzano". For Paolo, it has become a personal obsession. He has to join forces with Eva, a young and ambitious assistant DA of German origin. Her father used to be the DA on the same case - now she must prove herself. Eva also has an obsession, one that has nothing to do with the case: defending a young artist called Mathilde. But what is it with the young woman, that has Eva risking everything for her? Only one thing seems for sure: The monster will strike again.

For the past 30 years, Jean Dumas has been at the helm of Intelco, an investigation firm. Over the years, he has dealt with cases of marital infidelity, fraud by undeclared workers of the Commission des normes, de léquité, de la santé et de la sécurité du travail (CNESST), theft of intellectual property, industrial espionage and embezzlement. Jean Dumas has surrounded himself with an entire team to carry out his missions. He also tries to reconcile his personal life with his professional life. He also quickly realizes that he has more enemies than he ever imagined.

Rachel Miller and Émile Darcy, married Canadian Security Intelligence Service agents, live a peaceful life with their two daughters. However, everything crumbles for them when a shooting takes place near the American embassy.

In Fermont, a small mining town in northeast Quebec, the body of a young dancer is found. Detective Céline, one of the most experienced professionals, investigates the case.

Isabelle Gagnon is a firm believer in the magic of Christmas: the recipes, the gift exchanges, the naughty elves and the traditional family photos... Her preparations begin the day after Halloween. But this year, everything seems to be working against her. Everyone has other plans, and in these times of blended families, Isabelle will have to pedal hard to keep her gang around her this Christmas.