She waited until two AM.She lay in bed fully dressed and listened to the estate go quiet around her, the corridor emptying out, the building settling into itself, that particular silence that only came when everything large had finally stopped pretending it was still awake. Then she got up.She'd been planning this for three days. New route, new timing, the sentinel rotation mapped down to the minute....when they switched, which direction they moved, how long each gap lasted. Forty seconds at the east corner. Forty seconds to cross from the outer wall to the greenhouse path.She could do forty seconds.She pulled her dark jacket on and checked her tools and looked at herself in the mirror once, then looked away, then went out of her room.The grounds were cold.She moved along the outer wall with her back against the stone, slow and flat and silent, one hand trailing the surface, eyes forward, counting steps the way her father had taught her. The first sentinel passed the north corne
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