Atrus's Speech in K'veer (Riven Intro)
"Thank God you've returned! I need your help. There's a great deal of history that you should know, but I'm afraid that I must continue my writing. Here. Most of what you'll need to know is in there. Keep it well-hidden.
For reasons you'll discover, I can't send you to Riven with a way out, but I can give you this. It appears to be a linking book back here to D'ni, but it's actually a one-man prison. You'll need it, I'm afraid, to capture Gehn.
Once you've found Catherine, signal me, and I'll come with a linking book to bring us back.
There's also a chance, if this all goes well, that I might be able to get you back to the place that you came from." - Atrus