Gregor’s Briefcase

According to Bernard’s, Gregor is carrying highly enriched uranium in his briefcase. However, during his dining car chat with Nadia, Gregor opens the briefcase to reveal a tablet, which he uses to show Nadia a sampling of Manticore operatives executing Citadel agents from around the world. The typically unruffled Nadia realizes immediately that this is the beginning of the end of Citadel.