At the date, Prescott crashes the party. Shortly after, the date then relocates to the Psych Office, where it is crashed again, this time by Lassiter and Juliet, who insist that Gillian is the killer. Shawn and Gus vehemently disagree, saying Prescott is the killer. Suddenly, Shawn thinks he is poisoned, and says that he thinks it was Prescott who has been behind this whole thing. At the hospital, Shawn finds out he was indeed poisoned, but barely. In fact, it turns out he's going to be just fine. Later, Shawn and Jules question Prescott, but right in the middle Lassiter tells Prescott he is free to go, as they have no solid evidence against him and can no longer detain him. Shawn and Gus disrupt Prescott's next seminar, calling him a murderer. Prescott makes excuses, but in the end, he sincerely declares his love for Gillian. Privately, he tells Shawn and Gus that Gillian's friend Jean is practically penniless and Gillian is her only caretaker. That's when Shawn puts it all together. Lance's friend Gabe was dating Jean. He broke up with her when he realized she had no money and poisoned Lance in order to get to Gillian. They go to find Gabe but instead find him dead in the sauna. Shawn then comes up with another theory. All the victims were lovers of Gillian's, leading Shawn to believe Jean killed them out of jealousy. Just as Prescott is going to drink a poisoned cup of tea, Shawn and Gus interrupt and save him. Shawn makes the claim that Jean is the murdering lesbian who was in love with Gillian. In the end, Jean admits to the murders, and Prescott leaves for his honeymoon with Gillian. As a kind gesture for his efforts, Prescott leaves Shawn in charge of his class.

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