> Beans: Nail your notebooks to the floor.
What a great idea!
You can't take all your THEORY NOTEBOOKS with you at once, but you can make them UNSTEALABLE and UNREADABLE for the duration of your absence.
Unless an intruder has their own HAMMER or similar CONSTRUCTION TOOL, there's no way they could pry them off the floor.
And to GET REAL for a second, the SECONDS TWINS would no doubt be the most likely intruders in this scenario. No one in their RIGHT MIND would ever permit the SECONDS TWINS to possess any sort of CONSTRUCTION TOOL, supervised or otherwise.
Four of your most important NOTEBOOKS are now perfectly secure at the expense of your 4 spare NAILS, making the construction of a BOOBY TRAP feel increasingly like a PIPE DREAM.