"It may mean nothing, after all," said Fuller. "Curiosity probably induced some people to venture into the grounds this morning in order——"
"A man and woman entered the back room by this window," said Ashton-Kirk.
"I don't like to put myself in an attitude of continued protest," said Fuller, "but these low windows are commonly used that way. You see, it's only a step to the lawn."
Ashton-Kirk nodded.
"As you say," he agreed, "these low windows are commonly used in that way. But only when the rooms into which they open are also in common use."
"I see what you mean," said Fuller. "This back room is private. Old Nanon said the door was always kept locked." He remained gazing at the other for a moment, apparently pondering the new aspect which this discovery gave the situation. "Well, what do you think it means?"
"A woman and a man entered this room by the window; the latter had been left unfastened because it shows not the slightest indication of having been forced. And when they departed, the window was refastened—perhaps not at once, but as soon after as possible."
"You think——" Fuller paused, his eyes wide.
"If you heard a slight noise in the back room while you were in the library, some time after the murder, what would you think?"