The trap around the book triggers (apparently) randomly. Save just before you enter the hidden part of the lair. Walk up to the door. If you see a bit of shaking and hear a small amount of noise, reload and do something slightly different before walking near the door - I usually walk around the room and pick up loot. Eventually, you will get a scenario where the trap isn't already active (no shaking, no noise). It usually doesn't take me more than 1-2 tries.

I don't know if that is a bug or a hidden trigger, but it is a pain in the neck.

Last edited by RBarbare; 13/02/21 04:44 PM.