Scary Sherry: Bianca's Toast

S1 E15: On Halloween night in 1985, Shawn and Gus witness a troubled girl throw herself from her window at the Wispy Sunny Pines mental institution. From that moment on, "Scary Sherry" has haunted the halls of the now abandoned facility where we find a girl, Doreen, being chased by a ghost before falling through the same window to her death below. In the Psych office, Juliet comes to Shawn and Gus for help. She is undercover at the Beta Kappa Theta sorority, of which Doreen was a pledge. The going theory is that Doreen killed herself in a copycat of Sherry's original suicide but Juliet thinks there is more to the story.