Partridge retained Rob, the student. Rob acted 
	as if he were unaware of the killing when he entered the 
	inspector's office, but in mentioning the statue he gave 
	himself away. Partridge had said only that the professor had 
	been killed by a blow to the neck. Only to the other two 
	did he mention the statue as the murder weapon. 
	    Rob had snatched up the statue and struck the 
	professor in a moment of rage. He had then wiped off and 
	replaced the statue, and locked the door with the 
	professor's own keys to delay the discovery of the crime. 

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