Clearly imprinted upon the dust-coated gray stone of the sill was a confused series of marks—tracks call them what you will.
Smith straightened himself and turned a wondering look upon me.
"What is it, Petrie?" he said amazedly. "Some kind of bird has been here, and recently." Inspector Weymouth in turn examined the marks.
"I never saw bird tracks like these, Mr. Smith," he muttered.
Smith was tugging at the lobe of his ear.
"No," he returned reflectively; "come to think of it, neither did I."
He twisted around, looking at the man on the bed.
"Do you think it was all an illusion?" asked the detective.
"What about those marks on the window-sill?" jerked Smith.
He began restlessly pacing about the room, sometimes stopping before the locked safe and frequently glancing at Norris West.