A man fears he is dangerous to society and enlists Shawn and Gus' help because, he claims, he is a werewolf.
Stewart Gimbley bursts into the Psych office looking for help. He went to the police first but was referred to Shawn and Gus instead. Stewart wants the guys to lock him up and observe him overnight. He gives them a gun with silver bullets for their protection, because Stewart believes he's a werewolf. He thinks he killed a lamb last night and is worried that tonight he'll do worse. He offers them three times their rate, which they readily accept, thinking this will be easy money. They tie Stewart up but then fall asleep themselves, only to wake up to the sound of the window shattering. Stewart is gone and a tuft of grey animal hair dangles from a shard of glass. Later that night we see two hunters brutally attacked in the woods.
The next morning, Shawn and Gus go to the police station for help tracking Stewart. Lassiter, who spoke with Stewart earlier, tells them his sister Willow runs an occult shop. On their way out, they give Juliet the grey animal hair and ask her to run it through the lab. At the shop, Willow tells them Stewart was bitten in the woods a few weeks ago. He refuses to let her help him because he says he's too dangerous. Shawn spots a photo of Stewart with a group of people. Willow tells him they are Stewart's therapy group. They got together for his birthday. They are very close. Meanwhile, Stewart wakes up in the forest, naked and bloody, a few feet away from the slaughtered hunters.