Dwight: Dwight Schrute. How about "Andy is a problem and we must eliminate him?" Is that on the water? Michael: You guys think Donna's cheating on me? No.
Plan: A: Michael; Q: Who suspects Donna of cheating on him? A: PI Dwight Schrute; Q: Who does Michael hire to investigate Donna? A: the case; Q: What does Michael put Dwight Schrute on? A: Andy; Q: Who is frustrated when no one takes his customer's complaint seriously? Summary: Michael suspects Donna is cheating on him and puts PI Dwight Schrute on the case. Meanwhile, Andy is frustrated when no one takes his customer's complaint seriously.