They listened.
"Can't hear anything," said the policeman.
"You wouldn't, down here, with the window shut," said the Saint. "It's not very loud. But you can hear it quite clearly on the landing outside the flat."
"She's still sitting there, in that window," said the policeman.
They stared upwards, side by side.
"Sits very still, doesn't she?" said the Saint vaguely.
They stared longer.
"Funny," said the policeman, "now you come to mention it, she does sit still, Ain't never moved 'arf an inch, all this time we've been watching her."
"I don't like the look of it, officer," said the Saint nervously. "If you'd heard that noise—"
"Can't 'ear no noise now."