1. Add more summoning circles in the courtyard.
2. Servants could be spies. Dismiss them.
3. The door leading to the portal in Tel Rendys Hall is sealed with a ward of my own creations, a destructive resonance. Dispel switch deactivates the ward. Remember, it’s disguised. Use ghost sight lens before touching anything!
4. Banish the cook. I know she plans to poison me.
5. Encrypt book? Hide it? Encrypt AND hide it. I can’t trust anyone!