Candor or Dauntless

Clary is surprised when two black-clad strangers tumble out of nowhere. They introduce themselves as Tris and Four. They take the train to Dauntless compound and tell them about the factions and how life works there. Jace is surprised when they ask to play a strange game known as Candor or Dauntless. Long story short, lots of awkward questions and hilarious dares.