Eventually he'd let the answering machine take over and had hidden in his studio. Where he's hidden all his life. From the monster. He could feel it… - Louise Penny

He was very clever, he gave the impression of being tolerant and kind, while actually being very dark, very cunning.

I saw a lot of men die there. Most men. Do you know what killed them?”…”Despair,” said Finney. “They believed themselves to be prisoners. I lived with those men, ate the same maggot-infested food, slept in the same beds, did the same back-breaking work. But they died and I lived. Do you know why?” “You were free.” “I was free. Milton was right…the mind is its own place. I was never a prisoner. Not then, not now.

When Olivier had been taken away Gamache had sat back down and stared at the sack. what could be worse than Chaos, Despair, War?

What would even the Mountain flee from? Gamache had given it a lot of thought.

What haunted people even, perhaps especially, on their deathbed? What chased them, tortured them and brought some of them to their knees? And Gamache thought he had the answer.

Regret.

Regret for things said, for things done, and not done. Regret for the people they might have been. And failed to be.

Finally, when he was alone, the Chief Inspector had opened the sack and looking inside had realize he'd been wrong. The worst thing of all wasn't regret.