The bottom half of the window was wide open.
Miss Heredith, who was following his movements closely, gave vent to a faint cry of surprise.
"The window!" she exclaimed.
Musard looked round inquiringly.
"The window--what of it ?" he asked.
"It was closed when I came in here before dinner to see Violet." "You are quite sure of that ?" "Oh, yes! At least, I think so." "I do not understand you." "I mean that the atmosphere of the room was heavy and thick, as if the window had not been opened all day." "It has been a still, close day." "But Violet never had a window open if she could help it.

She disliked fresh air.

She was always afraid of catching cold." Musard looked out of the window into the velvet darkness of the night.
"If the window was closed before, the murderer has opened it and escaped through it," he said.
"It is hardly possible." "Why not ?" He turned round and faced her.
"The ground falls on that side.

The window is nearly twenty feet from the ground.

And--there is the moat to be crossed.