He descended the stairs and rejoined Musgrave, who was standing in a dark place on the opposite side of the street.
"Have you seen a light in that window?" asked Nick, pointing to the flat.
"No."
"Then Jones lied to me a minute ago when he said that his wife had just gone to bed. That window is in the principal bedroom of the flat."
"There's been no light there."
"Then they've fooled you, Musgrave."
"What do you mean?"
"I mean that Mrs. Jones is out."
"It can't be possible."
"It's true. She's gone out disguised as her own servant."