Shadow of the Torturer chapters 21 to 24
More meandering in the gardens. Severian witnesses people and an aeroplane from the past. Going to cut the avern, he encounters a man searching for the body of his wife Cas, a ferryman, nearly drowns as he is grasped by the hands of one of the dead bodies beneath the water, and takes up company with an amnesiac woman, Dorcas, who comes out of nowhere.
(Reminder: next time we only read the next 3 chapters).