Adding Specific Book To Library

Rather than starting a new thread, I'm adding it to this one.

I've got got hidden stairs down to the basement where the Secret Society will be. Unfortunately, the hole where the stairs are hidden is showing. In other tombs I've seen, this area is covered with floor tiles until the staircase is revealed. Any idea how I can do that to keep the stair area hidden?


While I'm at it, I've got an area where a Sim pulls a torch lever to open a hidden rotating door. After they enter, there is a foot switch that will close and lock the door while going on to the next stage. I also want that foot switch to deactivate the torch switch. I couldn't get that to happen though. Any ideas?

These guides might be of help if you haven’t already seen them… @MadDoctor61.

https://carls-sims-3-guide.com/worldadventures/tombbuilding.php

https://modthesims.info/t/452155

I've seen both of those, and a number of others. Carl's guide was little more that an introduction and wasn't really of any use. The one at ModTheSims was better, but neither answered my questions.