Bancroft was waiting for us in an exotic conservatory pinned to the seaward wing of the house. The glass walls were a riot of alien colours and forms, among which I picked out a young mirrorwood tree and numerous stands of martyrweed. Bancroft was standing next to one of the latter, spraying it carefully with a white metallic dust. I don't know much about martyrweed beyond its obvious uses as a security device, so I had no idea what the powder was.