This episode starts out with Monk getting a swirlie from Broderick Brody when they were kids. Scene fades to present time, 40 years later and Natalie is talking to someone on the phone that turns out to be Broderick who wants Monk to follow his wife to see if she is cheating on him. Monk jumps at the chance to bring bad news to the one who tormented him as a child. Monk finds her, or who he thinks is her in a bar with another man. Broderick says it couldn't have been her because he was with her. The next day a murder has occurred; it is the man whom Monk saw with Broderick's supposed wife. Broderick's wife comes to the police station and blames the murder on him. While Monk is question Broderick he puts it all together and figures out that Broderick's wife has a twin sister and she is the on that he saw at the bar with the other man and the one the killed the man in the hotel room. It was all over money. The twin sister Patrice Gesner was putting all of the Broderick's money in an offshore account and was going to kill them both, until Brody was arrested with took care of him. When the police rushed in Patrice Gesner (the twin sister to Marilyn Brody) was trying to kill her sister.
This was an Okay episode with a thin plot that was easy to follow and figure out.