She was awfully quiet, wasn't she? Then again, Caspian could understand that, being in a bit of shock, he assumed. Who wouldn't be, had they not been expecting to arrive in this strange place, as she clearly hadn't been. So he just waited her out patiently, playing with his fingers.
"They're a form of communication," he said, reaching across her with a little smile, and picking up the journal. "You write in it, and the other people that are here can see and respond," he explained, flipping through the journal, showing her the various entries from the many different people in the city. "Quite handy, I'd imagine. Though I haven't used mine yet," he admitted, shrugging a bit and passing it back to her.