The stranger beckons you over to a small door in the wall that you hadn't noticed before.
"Look," they say, "I'm sorry I can't tell you everything, but if you're still curious about it, I do have something I can show you, that
might give you a better idea of what's going on... at least, I hope it does."
They take out a ring of old-fashioned keys and put one into the lock seemingly at random, without looking through them first.
They pull the door open, and while there is only darkness to be seen on the other side, a draft of cool, fresh air slides into the room.
Enter the small door
"Actually, I think I'll explore by myself for a little while."