A reunion amongst friends evolves into a mission of discovery as Ash, Serena, Bonnie, and Clemont unearth the secrets of Lumiose's criminal underbelly. Their investigation opens a pandora's box of black marketers and their true, sinister intentions. Ash and Serena's relationship drama takes a backseat, Clemont becomes a part of Lumiose's political game, and Bonnie is challenged to become her own person.