A detective series centered around a police station in a working-class suburb of a provincial French city (the St. Herblain area of Nantes, to be exact), where detached houses with kitchen gardens rub shoulders with tower blocks. There's no mafia or organized crime, just petty lawbreaking, but it keeps our cops busy. Fights that get out of hand, conjugal disputes, quarrels between neighbors, family tiffs, pick-pocketing, pilfering from building sites, minor trafficking and illegal laborers. And plenty of bodily harm, from the trivial to the extremely grievous and, at times, even fatal. Against this backdrop of everyday lawlessness, the series paints a picture of people's lives when they slip out of control, veering into the comic, the tragic or the absurd.

1787, France. While investigating a series of mysterious murders, Joseph Guillotin - the future inventor of the world famous ‘Guillotine’ - uncovers an unknown virus: the Blue Blood. The disease quickly spreads amongst the French aristocracy, driving them to murder ordinary people and soon leads to a rebellion.

Through globalization, many countries have been opened and barriers removed to ensure easy trade, travel and cultural diversity. However, this openness has given opportunities to criminals looking to exploit the system and ultimately threaten our global safety. As Europe has become a "safe house" for criminals eluding law enforcers, a special kind of law enforcement team is needed to handle specific ongoing crimes on a global level. "Crossing Lines" is the story of one such team, made up of five international cops, headed by Captain Daniel. The team - comprised of individuals who have little in common - must learn to live and work under the most dangerous and potentially deadly conditions. Housed in an unused storage section underneath the ICC, this mismatched team faces bureaucratic, jurisdictional and cultural obstacles while traversing continents in pursuit of justice.