Rosa B4, aka Papillon d'Ombre, works to reclaim scattered Umbran treasures, making her way through the unseen corners of the world with her daughter. Her magic power is much stronger, and she could easily level an entire city were she so inclined. Although she and her daughter are surprised by the persistence of Inspector Enzeau at every turn, they've come to view his attempts to catch them as a form of entertainment, and consider thinking of new ways to tease and torment him a guilty pleasure.