I just had a thought about an Age that links you to a complex containing, among other things, another book.
The complex could be a research base, for many things, sort of like the SGC in Stargate SG1.
Your goal is to free all the locks surrounding the book within a certain time period, after which time your avatar panic links, simulating being caught being a restricted area, and all locks being sealed again.
What do you think of that idea?
I see no restrictions that an Age has to be old and abandoned, and we are the new writers of ages, which can enevitably mean linking to an Age very similar to our own with similar tech or more futuristic.