As the daring thief Arsène Lupin (Romain Duris) ransacks the homes of wealthy Parisians, the Police, with a secret weapon in their arsenal, attempt to ferret him out.As the daring thief Arsène Lupin (Romain Duris) ransacks the homes of wealthy Parisians, the Police, with a secret weapon in their arsenal, attempt to ferret him out.As the daring thief Arsène Lupin (Romain Duris) ransacks the homes of wealthy Parisians, the Police, with a secret weapon in their arsenal, attempt to ferret him out.