Bill Masen stumbles upon a blind couple in an apartment building hallway, in The Day of the Triffids: As I stepped outside, another door farther down the passage opened. I stopped, and stood still where I was. A young man came out, leading a fair-haired girl by the hand. As she stepped over the threshold he released his grasp. “Wait just a minute, darling,” he said. He took three or four steps on the silencing carpet. His outstretched hands found the window which ended the passage. His fingers went straight to the catch and opened it. I had a glimpse of a low-railed, ornamental balcony outside. “What are you doing,…