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.

Paris, France, early 19th century. The legendary convict François Vidocq lives in disguise trying to escape from a tragic past that torments him. When, after an unfortunate event, he crosses paths with the police chief, he makes a bold decision that will turn the ruthless mastermind of the Parisian underworld against him.