Matt had just stepped onto the tiled foyer when his cellphone vibrated in his pocket. He pulled it out and saw that it was a text from Audrey. The frenzied rush in the main hall was something he did not expect, and he stepped to one side; pressing against the wall he scanned the throng for Sergeant Gupta. Seeing him, he called out: “Sanjay! Over here.” Sanjay tap-danced an intricate choreography through the labyrinth of people until he stood opposite him. “What in blazes is going on?&rd...