Rouge and the Wolf is a crossover fiction with Carmen Sandiego (the netflix version) and Lupin III.
The story will take place 3 years after the Carmen series ended. With VILE defeated and captured by ACME, there are still cells and organizations of thieves who still aim to steal priceless...
Actually, the only thing that wasn't stolen at the Louvre's Apollo Gallery is the Regent Diamond, figure no one would take it because something to do with a curse.