She heard him before she saw him.
That was the thing she was not prepared for, out of all of it: Cassian Sinclair, who moved without any sound at all, who could cross a gallery in a second and a half without a floorboard going — Cassian came down the archive stairs like a man. Heavy. Uneven. One foot and then the other, the way you come downstairs in the dark in a house you do not know.