The group doesn't. You're carried through twisting corridors, guided by the party that now surrounds you rather than merely following you. By the time the corridors open into a large cave containing a lumber mill, at which point the group stops, you have no clue how long it’s been or how you got here, probably by design. The shadowy figure following you clears the room with a gesture, leaving you alone save for a few guards. You can now make out the face of a young woman on the formerly inscrutable figure due to your proximity to her. After a few seconds, seemingly to ensure that you aren't going to pull any tricks, she begins to speak. "I am Vanessa VanCleef," she says, "leader of the Defias Brotherhood, and you are now part of my legacy."
Let her keep talking. She seems to want to tell you important information. Let her keep it up. Ask her for more specifics on the Defias. Could be useful to find out more about the organization...or at least, what she wants you think about it. Ask her what you've just gotten yourself into. It's probably clear enough, but it might not hurt to check. Tell her that you know who she is. Knowing that you're aware of her reputation might give her a higher opinion of you.