 In the episode, an obviously disturbed man requests help from the two, believing that he is being haunted.Upon investigation, they decide it is actually the man's ex-girlfriend but find she is engaged and could not be the "ghost".After an attempt on their lives, Shawn and Gus look through the man's house again, finding a room full of women's belongings, where Shawn realizes the man has dissociative identity disorder and is the perpetrator of a murder spree.