The last mission takes place in your mansion.  That's all I can really say.  Yes, there is an ending, and it's great.  If you haven't seen the ending, then there's more missions to do.    
-Lasereth  
		
		
		
		
		
			
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				"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws."  -Roger Ebert
			 
		
		
		
		
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