Tea, Scones and Arsenic

Where to begin about this hidden gem?  You are a part of a dysfuctional family fighting over the inheritance and vying to be the last one standing.  Delightfully presented with what appears to be a real cookie tin with realistic cookies, you try and eat the most arsenic without dying.   Bluff your way to victory.  Use your spoon and sugar cubes wisely to be the last one standing!